http://www.facebook.com/ScienceReason ... [email protected]: EMS Electromagnetic Spectrum (Episode 2) - Radio Waves The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object. --- Please SUBSCRIBE to Science & Reason: • http://www.youtube.com/Best0fScience • http://www.youtube.com/ScienceTV • http://www.youtube.com/FFreeThinker --- MEASURING THE ELECTROMAGNETIC SPECTRUM The electromagnetic (EM) spectrum is just a name that scientists give a bunch of types of radiation when they want to talk about them as a group. Radiation is energy that travels and spreads out as it goes - visible light that comes from a lamp in your house and radio waves that come from a radio station are two types of electromagnetic radiation. Other examples of EM radiation are microwaves, infrared and ultraviolet light, X-rays and gamma-rays. Hotter, more energetic objects and events create higher energy radiation than cool objects. Only extremely hot objects or particles moving at very high velocities can create high-energy radiation like X-rays and gamma-rays. • http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html --- RADIO WAVES Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Like all other electromagnetic waves, they travel at the speed of light. Naturally-occurring radio waves are made by lightning, or by astronomical objects. Artificially-generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, satellite communication, computer networks and innumerable other applications. Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves may cover a part of the Earth very consistently, shorter waves can reflect off the ionosphere and travel around the world, and much shorter wavelengths bend or reflect very little and travel on a line of sight. Discovery and utilization: Radio waves were first predicted by mathematical work done in 1865 by James Clerk Maxwell. Maxwell noticed wavelike properties of light and similarities in electrical and magnetic observations. He then proposed equations, that described light waves and radio waves as waves of electromagnetism that travel in space. In 1887, Heinrich Hertz demonstrated the reality of Maxwell's electromagnetic waves by experimentally generating radio waves in his laboratory. Many inventions followed, making practical the use of radio waves to transfer information through space. Propagation: The study of electromagnetic phenomena such as reflection, refraction, polarization, diffraction and absorption is of critical importance in the study of how radio waves move in free space and over the surface of the Earth. Different frequencies experience different combinations of these phenomena in the Earth's atmosphere, making certain radio bands more useful for specific purposes than others. Radio communication: In order to receive radio signals, for instance from AM/FM radio stations, a radio antenna must be used. However, since the antenna will pick up thousands of radio signals at a time, a radio tuner is necessary to tune in to a particular frequency (or frequency range). This is typically done via a resonator (in its simplest form, a circuit with a capacitor and an inductor). The resonator is configured to resonate at a particular frequency (or frequency band), thus amplifying sine waves at that radio frequency, while ignoring other sine waves. Usually, either the inductor or the capacitor of the resonator is adjustable, allowing the user to change the frequency at which it resonates. In medicine: Radio frequency (RF) energy has been used in medical treatments for over 75 years generally for minimally invasive surgeries and coagulation, including the treatment of sleep apnea. • http://en.wikipedia.org/wiki/Radio_waves .
Views: 407861 Best0fScience
Subscribe Now: http://www.youtube.com/subscription_center?add_user=ehoweducation Watch More: http://www.youtube.com/ehoweducation A radio wave is just one type of electromagnetic radiation. Find out about how long it takes for radio waves to reach the moon with help from an experienced educator in this free video clip. Expert: Walter Unglaub Filmmaker: bjorn wilde Series Description: Physics plays a very important role in the world around us everyday, even if you don't necessarily realize it. Get tips on physics and chemistry with help from an experienced educator in this free video series.
Views: 4005 eHowEducation
Our TV shows have been broadcasting into space at the speed of light. The Twitter account @planettvguide is tracking when old TV signals reach planets that exists outside our solar system (we call these ‘exoplanets’). What’s showing on Alpha Centari? When will Seinfeld reach Pegasi b? Find out in our interplanetary TV guide!
Views: 6445 Vocativ
"KNOW ABOUT Difference Between Light and Radio Waves LIST OF RELATED VIDEOS OF Difference Between Light and Radio Waves IN THIS CHANNEL : Difference Between Light and Radio Waves https://www.youtube.com/watch?v=F9GzSW95NwQ Difference Between Peak to Peak and RMS https://www.youtube.com/watch?v=MOk9TnVhuUw Difference Between Dry Cell and Wet Cell https://www.youtube.com/watch?v=EpezKTOS2YY Difference Between Pitch and Volume https://www.youtube.com/watch?v=RQhXfhcnQow Difference Between Pulse and Wave https://www.youtube.com/watch?v=CsSIF6nNJeA Difference Between LiDAR and RADAR https://www.youtube.com/watch?v=aX5VZyCzfRI Difference Between Tangential Acceleration and Centripetal Acceleration https://www.youtube.com/watch?v=HUMrD4YbA8g Difference Between Photoelectric Effect and Photovoltaic Effect https://www.youtube.com/watch?v=X7YKOx2HOhs Difference Between Alpha Beta and Gamma Radiation https://www.youtube.com/watch?v=kQyyL9mnFm8 Difference Between Moment and Couple https://www.youtube.com/watch?v=YJitzH-yBBE"
Views: 10723 Just James
A neighboring galaxy, Messier 82, was found 8 years ago to be firing off radio waves at alarming speed. Source: https://www.disclose.tv Read here:https://helenastales.weebly.com/blogue/astronomers-observed-an-unknown-object-moving-at-four-times-the-speed-of-light-and-emitting-radio-signals Follow us on facebook: https://www.facebook.com/ufo.maniaII/
Views: 39815 UFOmania - The truth is out there
For more information: http://www.7activestudio.com [email protected] http://www.7activemedical.com/ [email protected] http://www.sciencetuts.com/ [email protected] Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. COMMUNICATION SYSTEMS: BANDWIDTH OF SIGNAL: In a communication system, the message signal can be voice, music, picture or computer data. Each of these signals has different ranges of frequencies. The type of communication system needed for a given signal depends on the band of frequencies which is considered essential for the communication process. For speech signals, frequency range 300 Hz to 3100 Hz is considered adequate. Therefore speech signal requires a bandwidth of 2800 Hz 3100 hertz – 300 hertz for commercial telephonic communication. To transmit music, an approximate bandwidth of 20 kHz is required because of the high frequencies produced by the musical instruments. The audible range of frequencies extends from 20 Hz to 20 kHz. Video signals for transmission of pictures require about 4.2 MHz of bandwidth. A TV signal contains both voice and picture and is usually allocated 6 MHz of bandwidth for transmission.In the preceeding paragraph, we have considered only analog signals. Digital signals are in the form of rectangular waves as shown in Figure. However, for practical purposes, the contribution from higher harmonics can be neglected, thus limiting the bandwidth. As a result, received waves are a distorted version of the transmitted one. If the bandwidth is large enough to accommodate a few harmonics, the information is not lost and the rectangular signal is more or less recovered. This is so because the higher the harmonic, less is its contribution to the wave form.
Views: 131470 7activestudio
This video examines the experiment Hertz performed to validate Maxwell's prediction for electromagnetic waves. It also touches on his observation of the photoelectric effect. Prepared to help students doing the HSC in Australia, it is suitable in other juridictions as well. Please consider supporting - https://www.patreon.com/HighSchoolPhysicsExplained Find me on facebook - www.facebook.com/HighSchoolPhysicsExplained
Views: 48877 High School Physics Explained
AM & FM radio have been around since way before the digital age. How can radios decode AM & FM signals only using analog technology? Freshbooks message: Head over to http://freshbooks.com/techquickie and don’t forget to enter Tech Quickie in the “How Did You Hear About Us” section when signing up for your free trial. Follow: http://twitter.com/linustech Join the community: http://linustechtips.com
Views: 469647 Techquickie
twitter: http://www.twitter.com/tweetsauce instagram: http://www.instagram.com/electricpants facebook: http://www.facebook.com/VsauceGaming SOURCES BELOW: this is the video where I talk about THE SPEED OF PUSH: https://www.youtube.com/watch?v=Do1lm9IevYE Big thanks to Martin Archer for help with this episode: http://www.martinarcher.co.uk/ And thanks to Guy Larsen for his shadow magic: https://twitter.com/guylar music by http://www.YouTube.com/JakeChudnow and http://www.audionetwork.com shadows faster than light: http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/FTL.html#3 http://physics.stackexchange.com/questions/63434/could-the-shadow-move-with-faster-than-light-speed http://www.madsci.org/posts/archives/2000-02/950834634.Ph.q.html making the moon brighter: http://what-if.xkcd.com/13/ sunset and earth’s shadow and belt of venus in single pics: http://apod.nasa.gov/apod/ap131024.html http://apod.nasa.gov/apod/ap100729.html amounts of evening-types in a city: http://weatherspark.com/averages/33125/Honolulu-Hawaii-United-States superluminal scissors: http://math.ucr.edu/home/baez/physics/Relativity/SR/scissors.html http://boards.straightdope.com/sdmb/archive/index.php/t-69757.html wave animations: http://www.ablongman.com/mullin/AnimationPages/FigsI-19&20.html http://www.acs.psu.edu/drussell/Demos/SWR/SWR.html http://resource.isvr.soton.ac.uk/spcg/tutorial/tutorial/Tutorial_files/Web-inter-superp.htm phase velocity vs. group velocity: http://resource.isvr.soton.ac.uk/spcg/tutorial/tutorial/Tutorial_files/Web-further-dispersive.htm faster than light dark patches: http://www.askamathematician.com/2013/02/q-is-darkness-a-wave-the-way-light-is-a-wave-what-is-the-speed-of-dark/ http://www.physicsclassroom.com/class/light/Lesson-3/The-Path-Difference make a light interference pattern at home: http://www.exploratorium.edu/snacks/diffraction/ http://www.instructables.com/id/How-to-perform-Interference-and-Diffranction-at-Ho/ the speed of ignorance: http://www.brainpickings.org/index.php/2012/04/02/stuart-firestein-ignorance-science/ http://philosophicalfallibilism.blogspot.com/2009_03_20_archive.html http://kk.org/thetechnium/2008/10/the-expansion-o/ http://louisecharente.wordpress.com/2013/10/24/the-discovery-of-ignorance/ Dunning-Kruger: http://www.huffingtonpost.com/david-macaray/the-dunningkruger-effect_b_4476166.html http://en.wikipedia.org/wiki/McArthur_Wheeler “animalcules”: http://www.leben.us/index.php/component/content/article/59-volume-3-issue-4/236-antoni-van-leeuwenhoeks-amazing-little-animalcules
Views: 14067774 Vsauce
Neil deGrasse Tyson explains why unexplained radio signals from outer space shouldn't automatically be attributed to extraterrestrial life. ➡ Subscribe: http://bit.ly/NatGeoSubscribe ➡ Watch all clips of StarTalk here: http://bit.ly/WatchStarTalk ➡ Get More StarTalk: http://bit.ly/NGStartalk About StarTalk: Host Neil deGrasse Tyson brings together celebrities, scientists and comedians to explore a variety of cosmic topics and collide pop culture with science in a way that late-night television has never seen before. Weekly topics range from popular science fiction, space travel, extraterrestrial life, the Big Bang, to the future of Earth and the environment. Tyson is an astrophysicist with a gifted ability to connect with everyone, inspiring us all to to "keep looking up." Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Listening for Aliens | StarTalk https://youtu.be/_mamMkXp8L4 National Geographic https://www.youtube.com/natgeo
Views: 53458 National Geographic
→Subscribe for new videos every day! https://www.youtube.com/user/TodayIFoundOut?sub_confirmation=1 →How "Dick" came to be short for 'Richard': https://youtu.be/BH1NAwwKtcg?list=PLR0XuDegDqP2Acy6g9Ta7hzC0Rr3RDS6q Never run out of things to say at the water cooler with TodayIFoundOut! Brand new videos 7 days a week! More from TodayIFoundOut In this video: In this video, we're looking at why it is that some radio signals, like am radio, propagate much farther at night than during the day, allowing you to potentially pick up an am radio station sometimes even thousands of miles away from the broadcast source. Want the text version?: http://www.todayifoundout.com/index.php/2015/01/radio-signals-travel-night-day/ Sources: http://electronics.howstuffworks.com/radio4.htm http://electronics.howstuffworks.com/question1.htm http://en.wikipedia.org/wiki/Ionosphere http://en.wikipedia.org/wiki/AM_broadcasting http://www.fcc.gov/encyclopedia/why-am-radio-stations-must-reduce-power-change-operations-or-cease-broadcasting-night http://usatoday30.usatoday.com/news/science/wonderquest/2002-01-23-radio-waves.htm http://illumin.usc.edu/114/catch-a-wave-radio-waves-and-how-they-work/ http://www.cybercollege.com/frtv/frtv017.htm http://en.wikipedia.org/wiki/Skywave http://commons.wikimedia.org/wiki/File:Skywave_Effect_of_AM.png http://missionscience.nasa.gov/ems/03_behaviors.html Image Credit: https://commons.wikimedia.org/wiki/File:Skywave_Effect_of_AM.png http://apollo.lsc.vsc.edu/classes/met130/notes/chapter1/ion2.html http://radiojove.gsfc.nasa.gov/education/educ/radio/tran-rec/exerc/iono.htm https://en.wikipedia.org/wiki/File:Skywave.jpg https://commons.wikimedia.org/wiki/File:Amfm3-en-de.gif
Views: 17415 Today I Found Out
Be like SMART BANANA: https://goo.gl/JTfP6L Hey, Mr. Banana! I wonder why haven’t we heard anything from anyone in space. I mean, they could’ve sent a bright flash of light or at least a piece of space junk. The only thing that has recently disturbed the calm water of the space signals area was the bevy of high-speed flashes that came from 1.5 billion light-years away. Could this be a message from ETs? Let’s find out. Also check out new video about scientifically impossible places here on Earth: https://www.youtube.com/watch?v=IztX_vG1Jr8. It's awesome ! Music by Epidemic Sound: https://www.epidemicsound.com/ ---------------------------------------------------------------------------------------- Our Social Media: Facebook: http://facebook.com/enjoy.science/ The Bright Side of Youtube: https://goo.gl/rQTJZz 5-Minute Crafts Youtube: https://www.goo.gl/8JVmuC ---------------------------------------------------------------------------------------- For more videos and articles visit: http://www.brightside.me/
Views: 55019 SMART BANANA
You may be familiar with the speed of light, but the reason it exists and how we discovered it is pretty fascinating. Support me on Patreon! http://www.patreon.com/answerswithjoe Follow me at all my places! Instagram: https://instagram.com/answerswithjoe Snapchat: https://www.snapchat.com/add/answerswithjoe Facebook: http://www.facebook.com/answerswithjoe Twitter: https://www.twitter.com/answerswithjoe ============= LINKS LINKS LINKS: PBS Space Time videos: The Speed of Light is NOT About Light https://www.youtube.com/watch?v=msVuCEs8Ydo The Geometry of Causality https://youtu.be/1YFrISfN7jo http://www.iflscience.com/space/solar-system-speed-light/ https://en.wikipedia.org/wiki/Speed_of_light https://en.wikipedia.org/wiki/Lene_Hau https://aeon.co/essays/why-is-the-speed-of-light-the-speed-of-light https://www.sciencenews.org/article/speed-light-not-so-constant-after-all ============ Transcript: So when we talk about the speed of light, the first thing to remember is that light is just a sliver of the entire electromagnetic spectrum, ranging from gamma rays to radio waves. So we’re really talking about the speed of electromagnetism. James Clerk Maxwell was the genius who first described the properties of electromagnetism into physics equations. From these equations, we can calculate the speed of light. 299,792 kilometers per second. Einstein was able to prove through his theory of special relativity that the closer you get to the speed of light, the more time slows down for a person in that relative frame. And if you were to go the speed of light, time would stop altogether. So if you were able to travel faster than light through spacetime, time itself would actually flip. Time would go backwards. And that would break causality. Effect would precede cause, which is impossible. The speed of light is the speed of causality. The other prediction that supports a speed limit is the idea that inertia increases as velocity approaches the speed of light. That means mass increases. So mass is a speed impediment. Nothing that has mass can go the speed of light. But if you are massless, you can only go the speed of light, because you have no speed impediments. And photons are massless particles. Particles that must travel at the speed of light and because they are traveling at the speed of light, time stands still from its point of view. So really, that video I talked about earlier is all wrong, from the perspective of the photon, that journey would have occurred instantly. So when you look at a star at night, that massless photon might have traveled a million light-years to reach you, but its experience was instantaneous. Now there is another theory that’s a little controversial but starting to gain some ground. It says that the speed of light is actually caused by quantum vacuum fluctuations. See, quantum field theory claims that empty space is actually not empty at all but filled with quantum fluctuations and virtual particles popping in and out of existence. And two different teams of researchers have calculated c using electromagnetic properties of the quantum vacuum, so it could be that the quantum foam of virtual particles and fluctuations may be slowing the speed of light. But what if the speed of light wasn’t the speed of light? What if Galileo was right and the speed is infinite? Then nothing would exist. Because matter is made of energy, it would take infinite energy to create any mass. Time and space wouldn’t exist because all things communicate with each other instantaneously. Cause and effect wouldn’t exist. But if the speed of light were slower, that might be even cooler. Because then we could see all the way back to the big bang. The speed of light, of course, is just one of many constants in the universe, like gravity, the specific charges and masses of the fundamental particles, quantum effects, and the list goes on. A whole handful of very specific constants that if they were just a little bit different, we would never exist.
Views: 364017 Joe Scott
First of all, apologies for the shaky vid. By pressing certain keys on the stock radio, you can access the diagnostics menu. From there, you'll be able to display (among other things) the vehicle speed. The radio uses this speed signal from the ECU to automate the control of the audio volume; ie. the volume is increased as you go faster and vice versa.
Views: 82455 oj88
today i am going to explain you what is radio frequency and how it works and how to measure this RF Signal. more in formation and more tutorials available please visit this links https://www.saishtech.com https://www.facebook.com/saishtech https://www.linkedin.com/in/deepak-raut-9841ab43/ https://twitter.com/saishtech https://plus.google.com/u/0/+hitshortfilms -~-~~-~~~-~~-~- Download Desktop and Laptop drivers for HP, Lenovo, Dell, Sony, Asus, Acer etc. http://saishtech.com/ Download HP, Lenovo, Dell, Sony, Asus, Acer Laptop Motherboard Schematics http://saishtech.com/schematics/ Download Laptop & Desktop Bios http://saishtech.com/ Download HP, Canon, Epson, Brother, Ricoh, Samsung, Xerox Printer Drivers & Reseters http://saishtech.com/ Watch Laptop Repair Videos and Laptop Repair Course in Hindi Follow us on Twitter https://twitter.com/saishtech Follow us on facebook https://www.facebook.com/hitshortfilm Follow us on Google Plus https://plus.google.com/u/0/117581417171785096287 Follow us on Linkedin https://www.linkedin.com/in/deepak-raut-9841ab43/ Follow us on Reddit https://www.reddit.com/user/saishtech -~-~~-~~~-~~-~-
Views: 20996 Laptop Repair
"Do Radio Waves Travel At The Speed Of Light? Watch more videos for more knowledge How Do Radio Waves Compared To The Speed Of ... https://www.youtube.com/watch/jOoZhS5Ex24 Do All Electromagnetic Waves Travel At The Speed ... https://www.youtube.com/watch/uPHJVZb92QY What Is The Speed Of Radio Waves In Air? - YouTube https://www.youtube.com/watch/rpDDJdW-Vxs What Is The Speed Of Radio Waves In A Vacuum ... https://www.youtube.com/watch/FX68JUkf4Tw Frequency, Wavelength, and the Speed of Light ... https://www.youtube.com/watch/nwlhAXkzjj0 What Is The Velocity Of Radio Waves? - YouTube https://www.youtube.com/watch/AVG0CkAoOx8 Do Radio Waves Travel At The Speed Of Light ... https://www.youtube.com/watch/d-zexRX-3DQ How Do Radio Waves Travel? - YouTube https://www.youtube.com/watch/J4jYk1D9PRY How fast is the speed of light? Amazing Facts and ... https://www.youtube.com/watch/yZnxbrH_bK0 Why Is The Speed Of Light The Speed Of Light ... https://www.youtube.com/watch/kr_CFydcBZc Which Electronic Magnetic Wave Travels The ... https://www.youtube.com/watch/X6yoymvEg_w Are Radio Waves Or Sound Waves Faster? - YouTube https://www.youtube.com/watch/ufkkNXYKGek Are Radio Waves A Form Of Light Or Sound? - YouTube https://www.youtube.com/watch/gVQgnblUCfY What Is The Speed Of Visible Light? - YouTube https://www.youtube.com/watch/zTwTHh4Ihu4 Do All Waves Travel At The Same Speed? - YouTube https://www.youtube.com/watch/LEvXgNEGOEY How Do Radio Waves Travel In Space? - YouTube https://www.youtube.com/watch/5kiJ8DYHB8o How Do The Electromagnetic Waves Travel? - YouTube https://www.youtube.com/watch/ZGRPsoIYEUI What Is The Speed Of Light In Water? - YouTube https://www.youtube.com/watch/EYNSJx3Up2o How Do Waves Travel Through Space? - YouTube https://www.youtube.com/watch/BuXDHsKAvpg Electromagnetic Spectrum: Radio Waves - YouTube https://www.youtube.com/watch/al7sFP4C2TY"
Views: 46 ASK bulbul
For more information: http://www.7activestudio.com [email protected] http://www.7activemedical.com/ [email protected] http://www.sciencetuts.com/ [email protected] Contact: +91- 9700061777, +91- 9100061777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. PROPAGATION OF ELECTROMAGNETIC WAVES:In communication using radio waves, an antenna at the transmitter radiates the Electromagnetic waves EM waves, which travel through the space and reach the receiving antenna at the other end. As the EM wave travels away from the transmitter, the strength of the wave keeps on decreasing. Several factors influence the propagation of EM waves and the path they follow. At this point, it is also important to understand the composition of the earth’s atmosphere as it plays a vital role in the propagation of EM waves. A brief discussion on some useful layers of the atmosphere is given in Table. Ground wave: To radiate signals with high efficiency, the antennas should have a size comparable to the wavelength of the signal at least /4. At longer wavelengths i.e., at lower frequencies, the antennas have large physical size and they are located on or very near to the ground. In standard AM broadcast, ground based vertical towers are generally used as transmitting antennas. For such antennas, ground has a strong influence on the propagation of the signal. The mode of propagation is called surface wave propagation and the wave glides over the surface of the earth. A wave induces current in the ground over which it passes and it is attenuated as a result of absorption of energy by the earth. The attenuation of surface waves increases very rapidly with increase in frequency. The maximum range of coverage depends on the transmitted power and frequency less than a few MHz. Sky waves:In the frequency range from a few MHz up to 30 to 40 MHz, long distance communication can be achieved by ionospheric reflection of radio waves back towards the earth. This mode of propagation is called sky wave propagation and is used by short wave broadcast services. The ionosphere is so called because of the presence of a large number of ions or charged particles. It extends from a height of ~65 Km to about 400 Km above the earth’s surface. Ionisation occurs due to the absorption of the ultraviolet and other high-energy radiation coming from the sun by air molecules. The ionosphere is further subdivided into several layers, the details of which are given in Table. The degree of ionisation varies with the height. The density of atmosphere decreases with height. At great heights the solar radiation is intense but there are few molecules to be ionised. Close to the earth, even though the molecular concentration is very high, the radiation intensity is low so that the ionisation is again low. However, at some intermediate heights, there occurs a peak of ionisation density. The ionospheric layer acts as a reflector for a certain range of frequencies 3 to 30 MHz.Electromagnetic waves of frequencies higher than 30 MHz penetrate the ionosphere and escape. These phenomena are shown in the Figure. The phenomenon of bending of EM waves so that they are diverted towards the earth is similar to total internal reflection in optics.
Views: 217265 7activestudio
'There is something strange in the cosmic neighbourhood. An unknown object in the nearby galaxy M82 has started sending out radio waves, and the emission does not look like anything seen anywhere in the universe before. "We don't know what it is," says co-discoverer Tom Muxlow of Jodrell Bank Centre for Astrophysics near Macclesfield, UK. The thing appeared in May last year, while Muxlow and his colleagues were monitoring an unrelated stellar explosion in M82 using the MERLIN network of radio telescopes in the UK. A bright spot of radio emission emerged over only a few days, quite rapidly in astronomical terms. Since then it has done very little except baffle astrophysicists.' Read more: http://www.newscientist.com/article/dn18775-mysterious-radio-waves-emitted-from-nearby-galaxy.html?DCMP=OTC-rss&nsref=online-news Transcript: We begin with a composite image of the nearby starburst galaxy M82 that contains X-rays from Chandra in blue, optical data from Hubble in green and orange, and infrared data from Spitzer in red. Next we zoom into the central region of M82, where just Chandra's view is visible. There we see two bright X-ray sources of special interest. Astronomers think these may be medium-sized black holes. These "survivor" black holes seem to have avoided falling into the center of the galaxy. They could also be examples of seeds required for the growth of supermassive black holes in all galaxies, including the one in the Milky Way.
Views: 37100 AS N
Get Your Crash Course Physics Mug here: https://store.dftba.com/products/crashcourse-physics-mug Waves are cool. The more we learn about waves, the more we learn about a lot of things in physics. Everything from earthquakes to music! Ropes can tell us a lot about how traveling waves work so, in this episode of Crash Course Physics, Shini uses ropes (and animated ropes) to talk about how waves carry energy and how different kinds of waves transmit energy differently. -- Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashC... Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Patreon: http://www.patreon.com/crashcourse CC Kids: http://www.youtube.com/crashcoursekids
Views: 791280 CrashCourse
For accessing 7Activestudio videos on mobile Download SCIENCETUTS App to Access 120+ hours of Free digital content. For more information: http://www.7activestudio.com [email protected] http://www.7activemedical.com/ [email protected] http://www.sciencetuts.com/ Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. All electromagnetic waves move at the speed of light. Examples of electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays. Radio waves have the lowest energy and frequency and the longest wavelength. ... Radio waves are used for communications and radar.
Views: 17764 7activestudio
Download: https://soundcloud.com/ceptive/nasa-audio-highlights-repeating-extragalactic-radio-signal-frb-121102?in=ceptive/sets/nasa-audio-files-etc FULL INFO & INTERVIEW: https://goo.gl/aepNCZ 0:15-0:17 --- Original file (Rec 01) 0:30-1:00 --- AUD 01 (1m45-2m15) 1:15-1:45 --- AUD 02 (1m30-2m) 2:00-2:45 --- AUD 05 (1m30-2m15) 3:00-3:30 --- AUD 05 (2m45-3m15) (WATCH 200Hz) 3:45-4:15 --- AUD 07 (0m00-0m30) 4:30-5:15 --- AUD 07 (2m15-3m) (WATCH 200Hz) FULL POST: https://msdct.wordpress.com/2017/09/04/the-sounds-of-fast-radio-bursts-frb-121102-audio-analysis/ Fast Radio Burst 121102 after having reduced speed to approximately 1% of original recording (original average duration 2.1 seconds, processed version average duration 210 seconds). 9 recordings of FRB 121102 were processed and the peaks of activity have beeen selected and concatenated into an approx. 5 minute video with EQ and DB monitoring. Note that the original sample (audio 1) appears at the beginning, The hum does has a very eerie sound (like a low bassy pad) however there are two interesting aspects to these recordings. The first are the spikes in 4 of these recordings - they seem to exhibit some sort of doppler effect OR we are seeing the clearest recording at these spikes. Another interesting aspect is also the apparently silent portions of each recording during which a relatively long in duration white noise with a high frequency of above 20 kHz (appearing at 3:30-4 minutes and 4:45-5 minutes into the below file). Note the very dynamic range in all of the recordings - they cut off from the low end at around 400Hz and cut in high end at 15-20kHz. Also note that this is NOT white noise as white noise is consistent and the oscillation at normal activity is not consistent. Finally, the pulses are perfectly seperated by equal intervals between each pulse.
Views: 307359 Max Cresswell-Turner
Have these questions came to your mind? How you can browse wifi in a closed room. How WiFi signal can pass/cross/penetrate the wall or solid material but light fails to do? Is it really true for all materials? Let's understand how radio and light waves are related and interact with materials. Light penetrates glass which is solid, let's explore... more about the story at our blog: http://sciloo.com/2017/02/03/wifiradio-crossespenetratespass-wall-light-failsdoesnt/
Views: 3624 Sciloo - simplifying innovation
This animation shows how orbiters over Mars will monitor the landing of NASA's Curiosity rover. Curiosity will communicate with Earth via two of NASA's Mars orbiters, Mars Reconnaissance Orbiter and Odyssey. As the rover descends to the surface of Mars, it will send out two different types of data: basic radio-frequency tones that go directly to Earth (pink dashes) and more complex UHF radio data (blue circles). Odyssey will pick up the UHF signal and relay it immediately back to Earth (seen as a beam of small blue circles). Meanwhile, Mars Reconnaissance Orbiter will record the UHF data and play it back to Earth at a later time. Back on Earth, the rover's signals are picked up by large antenna dishes at NASA's Deep Space Network (DSN), which has three complexes in Goldstone, Calif., Madrid, Spain and Canberra, Australia. The DSN sends the information to Curiosity's mission control at NASA's Jet Propulsion Laboratory, Calif. As the rover descends to Mars, it will send out basic radio-frequency tones that go directly to Earth. NASA's Odyssey orbiter will then relay more complex UHF radio signals from the rover to Earth. NASA's Mars Reconnaissance Orbiter will fly over NASA's Curiosity (shown in pink) as the rover lands on the Red Planet. The video is slowed down as the orbiter approaches the landing site for better viewing. Mars Reconnaissance Orbiter will capture data during Curiosity's entry, descent and landing for later playback to Earth. Its High Resolution Imaging Science Experiment (HiRISE) camera will attempt to take an image of Curiosity as it descends to the surface (green). HiRISE is one of six instruments on NASA's Mars Reconnaissance Orbiter.
Views: 19469 Kowch737
In this lecture, we use an Analog Arts (http://analogarts.com/) SL987 oscilloscope to review the basics of waves, antennas, modulation concept, AM, and FM. Waves transfer energy without moving matter, similar to ocean waves or sun light. In general in air, electromagnetic waves such as radio signals travel longer than mechanical waves such as sound. To transmit information over very long distances, electromagnetic waves are used. Electromagnetic waves or EM waves spread without the need for a medium, travel at the speed of light, do not lose energy in vacuum, and can travel forever. Using a signal frequency of about 850 kHz, in December 1901, Guglielmo Marconi received the first transatlantic radio signals, the Morse code for the letter "S". An antenna converts an electrical signal to EM waves to make it transmittable. The length of the antenna inversely depends on the frequency of the signal. For low frequency signals such as electrical representation of sound out of a microphone, the size of the antenna grows to hundreds of kilometers, making the transmission impractical. Modulation overcomes this problem by mixing the low frequency information with a high frequency sinusoidal. In the modulation process, a low frequency information signal is put on a higher frequency sine wave, to produce a new waveform, which is suitable for transmission. The information is referred to as the modulating signal, the sine wave as the carrier signal, and the mix as the modulated carrier wave. Modulation process can be viewed as a ride carrying cargo from one place to another, where the cargo is the message and the ride is the carrier signal. At the destination, the detected signal is mixed with the carrier, and the resulting signal is filtered to produce the message. This process is called demodulation. AM and FM are two of the most popular modulation techniques. In AM the amplitude of the modulated signal represents the message. In FM however, the frequency of the modulated signal characterizes the message. Modulation concept is the process of varying one or more properties of a high frequency periodic waveform, referred to as the carrier signal, with an information signal, to transmit the information. It is like throwing a paper note across a distance by wrapping it around a stone. Since a sine wave is completely defined by its amplitude, frequency, and phase, in a modulation process, one or a combination of these properties is altered by the modulation signal. Once a low frequency wave is modulated, it travels longer and requires smaller transmission antennas. Modulation also allows multiple transmissions, each with its own unique carrier frequency. Each modulation technique offers its own benefits and is intended for a particular application. Both AM and FM techniques are widely used. Since lower frequencies are reflected better by the electrically charged atoms in the ionosphere, AM waves are spread in a wider area, particularly at night when the ionosphere is not affected by sun. An important advantage of FM is that it is not disturbed by outside interferences. Therefore, FM results in a higher quality transmission. The advent of digital signal processing, gave birth to digital modulation. Conceptually it is like analog modulation. However, it uses a discrete signal to modulate the carrier signal. Please join us.
Views: 5737 Academia
"What Is The Speed Of Radio Waves? Watch more videos for more knowledge Electromagnetic Spectrum: Radio Waves - YouTube https://www.youtube.com/watch/al7sFP4C2TY What Is The Velocity Of Radio Waves? - YouTube https://www.youtube.com/watch/AVG0CkAoOx8 What Is The Speed Of Radio Waves In Air? - YouTube https://www.youtube.com/watch/rpDDJdW-Vxs What Is The Speed Of Radio Waves In A Vacuum ... https://www.youtube.com/watch/FX68JUkf4Tw Speed of Electromagnetic Waves - YouTube https://www.youtube.com/watch/MQhN6uWRycA What Is The Wavelength Of The Radio Waves ... https://www.youtube.com/watch/Eg-B8Eefs6U How Do Radio Waves Compared To The Speed Of ... https://www.youtube.com/watch/jOoZhS5Ex24 What Is The Speed Of An Electromagnetic Wave In ... https://www.youtube.com/watch/VnuzwxMe4XY Difference Between Light and Radio Waves - YouTube https://www.youtube.com/watch/F9GzSW95NwQ How Do You Find The Wavelength Of Radio Waves ... https://www.youtube.com/watch/a5uzvg_zkQs How Do You Find The Wavelength Of Radio Waves ... https://www.youtube.com/watch/7LZypDGkIIU What is Radio Wave and How is Radio Wave ... https://www.youtube.com/watch/n1HnuYUjG-4 Radio Waves - YouTube https://www.youtube.com/watch/sRX2EY5Ubto Spectrum of Electromagnetic waves - YouTube https://www.youtube.com/watch/6FfKoLHtMiI Radar and Radio Waves - The Physical World ... https://www.youtube.com/watch/PIk9pVFhvfY Electromagnetic waves and the electromagnetic ... https://www.youtube.com/watch/7eutept5h0Q What Is RADIO WAVE? RADIO WAVE Definition ... https://www.youtube.com/watch/JsYPwwxVcdI Hertz and Radio Waves Explained - YouTube https://www.youtube.com/watch/UN37QEmW_ns%26vl%3Den Electromagnetic Waves - YouTube https://www.youtube.com/watch/WNkB8IY-k04 01 Electromagnetic Waves All Around Us - YouTube https://www.youtube.com/watch/mgZEmkZsAKM"
Views: 21 S AnswerZ
Created by David SantoPietro. Watch the next lesson: https://www.khanacademy.org/science/physics/light-waves/introduction-to-light-waves/v/polarization-of-light-linear-and-circular?utm_source=YT&utm_medium=Desc&utm_campaign=physics Missed the previous lesson? https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/doppler-effect-reflection-off-a-moving-object?utm_source=YT&utm_medium=Desc&utm_campaign=physics Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channel/UC0oGarQW2lE5PxhGoQAKV7Q?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 572077 khanacademymedicine
You've probably heard the trope about how aliens have been watching old episodes of "I Love Lucy" and might think these are our "historical documents". How far have our signals reached? Support us at: http://www.patreon.com/universetoday More stories at: http://www.universetoday.com/ Follow us on Twitter: @universetoday Follow us on Tumblr: http://universetoday.tumblr.com/ Like us on Facebook: https://www.facebook.com/universetoday Google+ - https://plus.google.com/+universetoday/ Instagram - http://instagram.com/universetoday Team: Fraser Cain - @fcain Jason Harmer - @jasoncharmer Susie Murph - @susiemmurph Brian Koberlein - @briankoberlein Chad Weber - [email protected] Kevin Gill - @kevinmgill Created by: Fraser Cain and Jason Harmer Edited by: Chad Weber Music: Left Spine Down - “X-Ray” https://www.youtube.com/watch?v=4tcoZNrSveE&feature=youtu.be Television transmissions expand outward from the Earth at the speed of light, and there’s a trope in science fiction that aliens have learned everything about humans by watching our television shows. If you’re 4 light-years away, you’re see the light from the Earth as it looked 4 years ago, and some of that light includes television transmissions, as radio waves are just another form of electromagnetism - it’s all just light. Humans began serious television service in the 1930s, and by the modern era, there were thousands of powerful transmitters pumping out electromagnetic radiation for all to see. So are aliens watching “I Love Lucy” or footage from World War II and believing it all to be part of our “Historical Documents”? The first radio broadcasts started in the early 1900s. At the time I’m recording this video, it’s late 2014, so those transmissions have escaped into space 114 years ago. This means our transmissions have reached a sphere of stars with a radius of 114 light-years. Are there other stars in that volume of space? Absolutely. It’s estimated that there are more than 14,000 stars within 100 light years of Earth. Most of those are tiny red dwarf stars, but there would be hundreds of sunlike stars. As we’re discovering, almost all of those stars will have planets, many of which will be Earthlike. It’s almost certain some of those stars will have planets in the habitable zone, and could have evolved life forms, technology and television sets and were able to learn of the Stealth Haze and the Mak’Tar chant of strength. Will the signals be powerful enough to stretch across the vast distances of space and reach another world so that many generations of aliens can hang their hopes that James Tiberius Kirk never visits their planet with his loose morals, questionably applied prime directive, irresistible charms and pants aflame with who knows what kinds of interstellar STIs? Here’s the problem. Broadcast towers transmit their signals outward in a sphere, which falls under the inverse square law. The strength of the signal decreases massively over distance. By the time you've gone a few light years, the signal is almost non-existent. Aliens could build a huge receiver, like the square kilometer array being built right now, but the signals they could receive from Earth would be a billion billion billion times weaker. Very hard to pick out from the background radiation. And by Grabthar's hammer, I assure you it’s only by focusing our transmissions and beaming them straight at another star do we stand a chance of alerting aliens of our presence. Which, like it or not, is something we've done. So there’s that. We’ve really been broadcasting our existence for hundreds of millions of years. The very presence of oxygen in the atmosphere of the Earth would tell any alien with a good enough telescope that there’s life here. Aliens could tell when we invented fire, when we developed steam technology, and what kinds of cars we like to drive, just by looking at our atmosphere. So don’t worry about our transmissions, the jig is up. What do you think? Is it a good idea to alert aliens to our presence? Should we get rid of all that oxygen in our atmosphere and keep a low profile? Thanks for watching! Never miss an episode by clicking subscribe. Our Patreon community is the reason these shows happen. We’d like to thank: Michael Collins Jamie Rich and the rest of the members who support us in making great space and astronomy content. Members get advance access to episodes, extras, contests, and other shenanigans with Jay, myself and the rest of the team. Want to get in on the action?
Views: 25679 Fraser Cain
Full podcast episodes: http://www.askaspaceman.com Support: http://www.patreon.com/pmsutter Follow: http://www.twitter.com/PaulMattSutter and http://www.facebook.com/PaulMattSutter Where do “weird” radio signals come from? Is this the first time we thought something weird was happening in space? Why does it make the news so much? I discuss these questions and more in today’s Ask a Spaceman! Support the show: http://www.patreon.com/pmsutter All episodes: http://www.AskASpaceman.com Follow on Twitter: http://www.twitter.com/PaulMattSutter Like on Facebook: http://www.facebook.com/PaulMattSutter Watch on YouTube: http://www.youtube.com/c/PaulMattSutter Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE! Big thanks to my top Patreon supporters this month: Justin G., Jerry, Tim F., Helge B., Alan M., Tim R., Ray S., Michael C., Bill S., Lars H., David C., Silvan W., David B., Kevin O., and Justin R.! Music by Jason Grady and Nick Bain. Hosted by Paul M. Sutter, who is a legit scientist (http://www.pmsutter.com)
Views: 1711 Paul M. Sutter
124 - Electromagnetic Waves In this video Paul Andersen details the characteristics of electromagnetic waves. Electromagnetic waves are transverse waves that can move through both mediums and vacuums. The electric and magnetic fields oscillate perpendicular to the wave direction. Do you speak another language? Help me translate my videos: http://www.bozemanscience.com/translations/ Music Attribution Title: String Theory Artist: Herman Jolly http://sunsetvalley.bandcamp.com/track/string-theory All of the images are licensed under creative commons and public domain licensing: “Electromagnetic Radiation.” Wikipedia, the Free Encyclopedia, May 2, 2015. http://en.wikipedia.org/w/index.php?title=Electromagnetic_radiation&oldid=660494482. ESO. English: Artist’s Impression of How Type Ia Supernovae May Look like as Revealed by Spectro-Polarimetry Observations. The Outer Regions of the Blast Cloud Is Asymmetric, with Different Materials Found in “Clumps”, While the Inner Regions Are Smooth. Using Observations of 17 Supernovae Made over More than 10 Years with ESO’s Very Large Telescope and the McDonald Observatory’s Otto Struve Telescope, Astronomers Inferred the Shape and Structure of the Debris Cloud Thrown out from Type Ia Supernovae. Such Supernovae Are Thought to Be the Result of the Explosion of a Small and Dense Star — a White Dwarf — inside a Binary System. As Its Companion Continuously Spills Matter onto the White Dwarf, the White Dwarf Reaches a Critical Mass, Leading to a Fatal Instability and the Supernova. But What Sparks the Initial Explosion, and How the Blast Travels through the Star Have Long Been Thorny Issues. The Study Shows That the Outer Regions of the Blast Cloud Is Asymmetric, with Different Materials Found in “Clumps”, While the Inner Regions Are Smooth., November 30, 2006. http://www.eso.org/public/images/eso0644a/. http://commons.wikimedia.org/wiki/File:Artist%27s_impression_of_how_Type_Ia_supernovae_may_look_like_as_revealed_by_spectro-polarimetry_observations.jpg. Esquembre, Lookang many thanks to Fu-Kwun Hwang and author of Easy Java Simulation = Francisco. English: Electromagnetic Waves Can Be Imagined as a Self-Propagating Transverse Oscillating Wave of Electric and Magnetic Fields. This Diagram Shows a Plane Linearly Polarized Wave Propagating from Left to Right. The Electric Field Is in a Vertical Plane and the Magnetic Field in a Horizontal Plane., October 5, 2011. Own work. http://commons.wikimedia.org/wiki/File:Electromagneticwave3Dfromside.gif. McLassus, Roger. Deutsch: Das Bild Zeigt Eine Realistische Störung Der Wasseroberfläche (durch Kurzes Eintauchen Eines Stabes) Und Die Ausbreitung Dieser Störung Durch Kreiswellen von Eingeschränkter Konzentrizität Und Deren Überlagerungen. Der Flache Beleuchtungswinkel Gibt Dem Wasser Ein Fast Metallisches Aussehen.English: Surface Waves of Water: Expansion of a Disturbance. – It Shows a Realistic Disturbance (caused by Shortly Dipping a Stick into the Water) and Its Expansion Forming Interfering Circles of Limited Concentricity. The near Metallic Appearance of the Water’s Surface Is due to the Small Angle of illumination.Español: Ondas Superficiales En El Agua: Expansión de Una Perturbación. – Muestra Una Representación Realista de Una Perturbación (causada Por Sumergir Por Un Instante Un Palito En El Agua) Y Su Expansión Formando Círculos Concéntricos Que Interfieren. La Apariencia Metálica de La Superficie Del Agua Se Debe Al Bajo Ángulo En La iluminación.Français : Ondes de Surface Sur de L’eau : L’expansion D’une Perturbation. On Observe Une Perturbation Réaliste (due À Un Bâton) et Son Expansion Sous La Forme D’ondes Interférentes et Grossièrement Concentriques. L’aspect Quasi Métallique de L’eau Est Dû À Une Lumière rasante.Português: Ondas de Superfície de Água: A Expansão de Um Distúrbio. É Mostrada a Perturbação Realística (causada Por Um Bastão) E Sua Expansão Formando Círculos de Interferência Aproximadamente Concêntricos. A Aparência Metálica Da Superfície É Resultante Do Baixo Ângulo de Iluminação., January 14, 2006. picture taken by Roger McLassus (improved by DemonDeLuxe, Sep 2006). http://commons.wikimedia.org/wiki/File:2006-01-14_Surface_waves.jpg. “Photon.” Wikipedia, the Free Encyclopedia, May 1, 2015. http://en.wikipedia.org/w/index.php?title=Photon&oldid=660185835. “Sun.” Wikipedia, the Free Encyclopedia, May 5, 2015. http://en.wikipedia.org/w/index.php?title=Sun&oldid=660992057.
Views: 124866 Bozeman Science
ESA employs 130 ton satellite dishes, dispersed in key areas all over the world to monitor the skies for transmissions. They boost faint signals from spacecraft and in reverse create high energy transmissions to relay commands. Credit: ESA
Views: 52999 VideoFromSpace
This tutorial will show you how to quadruple your WiFi Internet Speed! Subscribe Here ▶ https://www.youtube.com/user/ThioJoe?sub_confirmation=1 This tutorial goes in depth on how to increase your WiFi internet speed by optimizing the wireless signals going into your router antennas. We will use salt to create a barrier to block the wifi interference, and improve the efficiency of the router. This will result in much faster uploading and downloading, and just faster internet overall! LOL JK APRIL FOOLS ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Views: 4118027 ThioJoe
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 GHz to as low as 3 kHz, though some definitions describe waves above 1 or 3 GHz as microwaves, or include waves of any lower frequency. At 300 GHz, the corresponding wavelength is 1 mm (0.039 in), and at 3 kHz is 100 km (62 mi). Like all other electromagnetic waves, they travel at the speed of light. Naturally occurring radio waves are generated by lightning, or by astronomical objects. Artificially generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, communications satellites, computer networks and innumerable other applications. Radio waves are generated by radio transmitters and received by radio receivers. Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves can diffract around obstacles like mountains and follow the contour of the earth (ground waves), shorter waves can reflect off the ionosphere and return to earth beyond the horizon (skywaves), while much shorter wavelengths bend or diffract very little and travel on a line of sight, so their propagation distances are limited to the visual horizon. To prevent interference between different users, the artificial generation and use of radio waves is strictly regulated by law, coordinated by an international body called the International Telecommunications Union (ITU), which defines radio waves as "electromagnetic waves of frequencies arbitrarily lower than 3 000 GHz, propagated in space without artificial guide". The radio spectrum is divided into a number of radio bands on the basis of frequency, allocated to different uses. Discovery and exploitation Radio waves were first predicted by mathematical work done in 1867 by Scottish mathematical physicist James Clerk Maxwell. Maxwell noticed wavelike properties of light and similarities in electrical and magnetic observations. His mathematical theory, now called Maxwell's equations, described light waves and radio waves as waves of electromagnetism that travel in space, radiated by a charged particle as it undergoes acceleration. In 1887, Heinrich Hertz demonstrated the reality of Maxwell's electromagnetic waves by experimentally generating radio waves in his laboratory, showing that they exhibited the same wave properties as light: standing waves, refraction, diffraction, and polarization. Radio waves were first used for communication in the mid 1890s by Guglielmo Marconi, who developed the first practical radio transmitters and receivers. Source: www.nasa.gov and https://en.wikipedia.org/wiki/Radio_wave CREDIT: National Aeronautics and Space Administration Support the Channel vie BOOK DEPOSITARY Shopping Book Depository: Millions of books with free delivery worldwide http://www.bookdepository.com/?a_aid=Booklibrary Enjoy, Like and Subscribe:)
Views: 1793 Sherlock Holmes
On the night of Jan 19 2008 at 05:00 UTC I heard signals bouncing off of the moon. This was an experiment using the HF Active Auroral Research Program (HAARP) 3.6 MW transmitter system in Alaska, which can aim a lot of RF into the sky. At 05:00 they transmitted on 6.7925 MHz. The transmitter is on for 2 seconds and off for 3 seconds and repeated this cycle for an hour. The signal from Earth to Moon and back to Earth takes 2.7 seconds. So after the transmitter shuts off, if the signal is strong enough, we can hear the signal bouncing off of the moon. The signal strength was from 0 to about S3. The Alaska transmitter is heard at 30 over S9 at times. I was able to hear signals bouncing off of the moon using my Kenwood TS-2000 with a 40 meter dipole up about 25 feet. Not bad DX. Their calculation show that the power delivered at the terminals of a resonant 40 meter dipole antenna is 2.5 X 10-13 Watts or about -96 dBm. This is equivalent to about 4.4 microvolts across 70 ohms. That is 2.5 billion watts. They had to re-aim the beam every 3 minutes at the moon. Question in the comments, can you calculate the distance to the moon from the echo? YES Looking at the signal at 10:28. I used the 2 second transmit time as a time-lenght reference. From the beginning of the transmission to the beginning of the echo, I measure 2.5 seconds, which is round trip time. So, 1.25 seconds one way. 1.25 seconds times 186,000 miles per second (radio wave speed) = 232,500 miles. Google shows 238,900 miles, average distance. Not bad using ruler measuring the signal on the computer screen. ARRL Link: http://www.arrl.org/?artid=7958 HAARP Moon bounce Link: http://www.haarp.alaska.edu/haarp/mbann.html HAARP Link: http://www.haarp.alaska.edu/haarp/index.html
Views: 85618 K7AGE
◆ Nanostation - http://ali.pub/1hthym ◆ Cable for Wi-Fi card - http://ali.pub/1htust ◆ Cheap Wi-Fi adapter - http://ali.pub/1hu6oe ◆ Powerful suitable adapter - http://ali.pub/1hxm66 ◆ Antenna cable 10m 33FT RP - http://ali.pub/1hu529 ◆ Long Distance USB WiFi Antenna Indoors - http://ali.pub/1htijf ◆ USB wi-fi adapter with a powerful antenna - http://ali.pub/1hxp1f In this video I will you how to boost 3G, 4G and Wi-Fi signals employing an incredibly simple method. This method attracted me by its reliability and availability. It's a home made antenna with a reflector- BI-Quad antenna Charchenko. with the help of this antenna you can significantly increase both its reception and its propagation of radio waves. Its assembling is quiet simple. We need a 2-3 thick copper wire, a high quality cable with 50 Оhm wave resistance and a metal-clad glass textolit as a reflector, a paper-based laminate or at least a sheet of metal. The process of making is really easy. You need to take a wire to bend an antenna into the shape of an octangle and to solder a wire to it. You need to find an antenna on a modem or a router and if the antenna you find is a built-in antenna, you will need to cut if out and after soldering all parts to solder a wire instead. The results we got are far beyond what we expected. The 3G modem speed increased from 0.6 to 16 megabytes. Speaking about the router its amplification factor increased from to 8 Db. The reception of our cell phone increased as well. We could use Wi-Fi when we were 300 meters away from the house. We still have lots of ideas but due to difficult situation in Luhansk we are really short of money. But you, our view, can help us in our experiments. Undoubtedly you have some great experiments and incredible discoveries ahead of you! Thanks to your help our videos are recorded more frequently! We will be happy to receive any financial aid you can provide. - PayPal: [email protected] - QIWI: +380936585529 - Yandex Money: 410012480761910 - Sberbank: 4276 8800 1504 2520 - WebMoney: R222480076424, Z176331835879 On our channel you can find videos about incredible experiments with electricity, different experiments and inventions. Here we share our new ideas that differ from the usual way of thinking of the majority. Subscribe for our channel and you will come to know a lot of interesting ! Share your ideas in our community https://vk.com/kreosann
Views: 3942588 KREOSAN English
The Voyager space probes are the furthest man made objects from Earth. With Voyager 1 being 21 Billion Kilometres from Earth, communication with the Space probe relies on the Deep Space Network. But how far can Voyager 1 go before we lose communication? This video looks at how we communicate with Voyager and when it will eventually stop receiving our signals. Thanks for watching this Primal Space video. If you enjoyed it, let me know in the comments below and don't forget to subscribe so you can see more videos like this! Support Primal Space by becoming a Patron! https://www.patreon.com/primalspace Twitter: https://twitter.com/thePrimalSpace Music used in this video: » Angelic Forest - Doug Maxwell » Proud - Bobby Renz » Marianas - Quincas Moreira » Court and Page - Silent Partner
Views: 2325837 Primal Space
Scientists are reporting fast radio bursts coming from a source as far as 3 billion light years away. Patrick Jones (@Patrick_E_Jones) has info on what they think the source is. Subscribe to our channel: http://www.youtube.com/buzz60 Buzz60 is designed for the way we live now. Short, quirky video snacks that are a little sassy, and always smart. Buzz 60 -- and the Buzz60 channel on YouTube - produces all kinds of news video clips for web viewers who want more than just repurposed content. Our team is a diverse group of video journalists with dozens of Emmy awards, an authentic sense of humor, and a mandate to connect with viewers every day. Like us Facebook: http://www.facebook.com/buzz60 Follow us on Twitter: http://twitter.com/Buzz60 Add us to your Circle on Google+: http://bit.ly/12nIt6n
Views: 439 b/60
http://videobrainbulb.blogspot.com/ https://www.instagram.com/brainbulb4/ https://twitter.com/RocketBrainbulb https://plus.google.com/u/0/106017714439699192221 https://www.facebook.com/Brainbulb4/ Wings by Nicolai Heidlas Music https://soundcloud.com/nicolai-heidlas Creative Commons — Attribution 3.0 Unported— CC BY 3.0 http://creativecommons.org/licenses/b... Music provided by Music for Creators https://youtu.be/a88RZOxv6kI
Views: 1211 Brain Bulb
In 1977; the Big Ear radio observatory picked up an unexplained, foreign signal from deep space- and ever since that day, the transmission, more commonly known as the Wow! Signal. has become a staple for alien enthusiasts and advocates that we are not alone. But what was the signal? With no clear meaning, clear origin point, clear source or clear age; there are so many questions surrounding what is probably the most famous unexplained extra-terrestrial event in astronomical history! SUBSCRIBE and become a member of the #SeaTards! We're trying to go for 100,000 subscribers on the channel by the end of the year! Subscriptions aren't expected but are hugely appreciated! :) Join the SeaTards Public Discord Server too! https://discord.gg/aKwXPac FOOTAGE: Space Journey: https://www.youtube.com/watch?v=Un5SEJ8MyPc&t=414s Nebula: https://www.youtube.com/channel/UCDyoFl3axaufRwkpBA38-1w
Views: 19336 SEA
How quickly can you transmit a signal across a 5mm plate? .5 h This could be used to transmit information long distances in circuits. My channel is moving to an official Cell Lab channel! Same content from a team of contributors. Subscribe: https://www.youtube.com/channel/UCKw7QHCr7XV2_NbrX3a1C4Q
Views: 7800 Bart Wisialowski
Neat little prank device I made from a schematic online. Effectively jams FM radios and TV's. Boost 9V with this circuit to power the one below: http://www.eleccircuit.com/voltage-doubler-with-ic-555/ Circuit here: http://www.next.gr/inside-circuits/TV-and-FM-jammer-schematic-l4106.html ** Attach a length of wire or small antenna to the center of the 6T coil above.** Maximum voltage input is 30VDC. Using more than the 9v specified, AND adding an antenna, makes this very powerful/illegal. Make sure you are only jamming yourself / friends / family. Thanks For Watching! ***If you enjoy watching my videos, please show your support by SUBSCRIBING, POSTING LINKS to my videos on other websites & blogs, rating a "THUMBS UP", and watching my video playlists. Doing so helps to ensure that many more videos will be released in the future. (Views are essential to ensure this channel remains in an active state)***
Views: 120976 electronicsNmore
Millimeter waves, massive MIMO, full duplex, beamforming, and small cells are just a few of the technologies that could enable ultrafast 5G networks. Read more: http://spectrum.ieee.org/video/telecom/wireless/everything-you-need-to-know-about-5g Today’s mobile users want faster data speeds and more reliable service. The next generation of wireless networks—5G—promises to deliver that, and much more. With 5G, users should be able to download a high-definition film in under a second (a task that could take 10 minutes on 4G LTE). And wireless engineers say these networks will boost the development of other new technologies, too, such as autonomous vehicles, virtual reality, and the Internet of Things. If all goes well, telecommunications companies hope to debut the first commercial 5G networks in the early 2020s. Right now, though, 5G is still in the planning stages, and companies and industry groups are working together to figure out exactly what it will be. But they all agree on one matter: As the number of mobile users and their demand for data rises, 5G must handle far more traffic at much higher speeds than the base stations that make up today’s cellular networks. Read more: http://spectrum.ieee.org/video/telecom/wireless/everything-you-need-to-know-about-5g
Views: 1577013 IEEE Spectrum
Greg Foot explains how Wi-Fi actually works, how similar it is to The Force and why it can't turn you into The Incredible Hulk! Subscribe for more awesome science - http://www.youtube.com/subscription_center?add_user=HeadsqueezeTV http://www.youtube.com/user/HeadsqueezeTV
Views: 595815 BBC Earth Lab
NASA detected, intercepted, and decoded a mathematically-based distress signal from a purportedly doomed planetoid outside our own galaxy. The signal was detected in January of 1998 but, however and as it might be expected, it took many years to properly decode the message. NASA experts claim to have intercepted an intergalactic distress call from an alien civilization that had already peaked and was actually dying when saber-tooth tigers still roamed the earth. The 80,000-year-old SOS was received and digitally recorded in late January 1998. But only in 2011 have radio astronomers and language experts found the key to the complex mathematics-based language that enabled them to translate the 'frantic plea for help'. The world press has been suspiciously silent about the startling message, though lengthy scientific reports are scheduled for publication in two professional journals, Radio Astronomy and Universe. According to a highly placed NASA source in Houston, Texas, noted Russian superior officer Gen. in ex-Soviet Union’s army, Viktor Kulikov was leading a United Nations research team from a state-operated observatory 50 miles northwest of Moscow. http://en.wikipedia.org/wiki/Viktor_Kulikov Gen. Victor Kulikov told Universe that the signal emanated from a point beyond the galaxy nearest to our own, Andromeda, and was sent by beings that had apparently achieved a civilization no more advanced than our own here on Earth. “The simple fact that we received and decoded the message proves beyond any doubt that their knowledge and technology were, at the very best, within our reach.” Dr. Kulikov explained. “And while there are years of study ahead of us, I can say with certainty that the death of their civilization was not the result of some cosmic catastrophe. It was the result of the civilization turning on itself, possibly with devastating nuclear weaponry.” Dr Kulikov flatly refused to provide either of the magazines with a transcript of the message, but he did say it began with the plea, “Help us,” and went on to give data pinpointing the exact position of the doomed planet. There was a quite lucid account of apocalyptic devastation, hellish explosions, widespread death and terminal illnesses,” he said. “A Shower of meteors? Perhaps. But what stikes me, and this is just a feeling, is an underlying acceptance of guilt. It’s as if the senders of the message are acknowledging blame for what happened.” "Whatever it was, they apparently had no means to evacuate the remaining population. Interplanetary space travel was available to them, but only on a very limited level. The message makes it very clear that they were trapped on their world,” said Dr. Kulikov. The article was written by two journals. NASA simply managed to not get much publicity. At that time the newspapers wrote very little about this issue. When after thirteen years managed to decrypt the message fails to hide from the media. Clips credit: ESO, ESA/HUBBLE & NASA Music credit: YouTube Audio Library 1) It's Coming - JOSH KIRSCH MEDIA RIGHT PRODUCTIONS 2) Decisions by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/) Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100756 Artist: http://incompetech.com/
Views: 6727779 nemesis maturity
RC cars are fun. ► Powered by Traxxas | Click HERE to see all the RC cars used in this video! http://bit.ly/TraxxasRCDudes ► VISIT our NEW STORE - http://dudeperfect.merchline.com ► Click HERE to watch the BONUS video! http://bit.ly/RCeditionBonus Play our FREE new iPhone game!! ►Play FREE on iPhone -- http://smarturl.it/DudePerfect2 ► PLAY FREE on Android -- http://smarturl.it/DudePerfect2 ► PLAY FREE on iPad -- http://smarturl.it/DudePerfect2iPad Music by Joel Vaughn Play: ► Click HERE to download "In This World (Unikron Remix)" http://bit.ly/InThisWorldSong “Note: For this hydroplaning run we used a stock Slash 4X4 with Traxxas Stability Management and included optional high-speed gearing with a Traxxas Power Cell 3s LiPo. We installed aftermarket paddle tires to propel across the water. We also secured pre-cut foam noodle sections for flotation – just in case. Vehicles shown are being operated by professional drivers in a controlled environment. For the safety of users, others, and the product, please do not imitate the maneuvers performed in this video.” -Traxxas ► VISIT our NEW STORE - http://dudeperfect.merchline.com ► JOIN our NEWSLETTER - http://bit.ly/DPNewsletterEndCard ► WATCH our STEREOTYPES - http://bit.ly/StereotypesPlaylist Some of our biggest videos ever are coming out soon so stay tuned so you won't miss a thing! ►Subscribe here: http://bit.ly/DudePerfect In between videos we hang out with you guys on Instagram, Vine, Twitter, and Facebook so pick your favorite one and hang with us there too! http://Instagram.com/DudePerfect https://Vine.co/DudePerfect http://Twitter.com/DudePerfect http://Facebook.com/DudePerfect Do you have a GO BIG mindset? See for yourself in our book "Go Big." ►http://amzn.to/OYdZ2s A special thanks to those of you who play our iPhone Game and read our book. You guys are amazing and all the great things you tell us about the game and the book make those projects so worthwhile for us! Dude Perfect GAME - http://smarturl.it/DudePerfect2 Dude Perfect BOOK - "Go Big" - http://amzn.to/OYdZ2s Click here if you want to learn more about Dude Perfect: http://www.dudeperfect.com/blog-2/ Bonus points if you're still reading this! Comment “Those look so fun!" As always...Go Big and God Bless! - Your friends at Dude Perfect Business or Media, please contact us at: [email protected]
Views: 84678259 Dude Perfect
Extracting Gait Velocity and Stride Length from Surrounding Radio Signals Chen-Yu Hsu, Yuchen Liu, Zachary Kabelac, Rumen Hristov, Dina Katabi, Christine Liu CHI '17: ACM CHI Conference on Human Factors in Computing Systems Session: Methods and Theories Abstract Gait velocity and stride length are critical health indicators for older adults. A decade of medical research shows that they provide a predictor of future falls, hospitalization, and functional decline among seniors. However, currently these metrics are measured only occasionally during medical visits. Such infrequent measurements hamper the opportunity to detect changes and intervene early in the impairment process. In this paper, we develop a sensor that uses radio signals to continuously measure gait velocity and stride length at home. Our sensor hangs on a wall like a picture frame. It does not require the monitored person to wear or carry a device on her body. Our approach builds on recent advances in wireless systems which have shown that one can locate people based on how their bodies impact the surrounding radio signals. We demonstrate the accuracy of our method by comparing it to the gold standard in clinical tests, and the VICON motion tracking system. Our experience from deploying the sensor in 14 homes indicates comfort with the technology and a high acceptance rate. DOI:: http://dx.doi.org/10.1145/3025453.3025937 WEB:: https://chi2017.acm.org/ Recorded at the ACM CHI Conference on Human Factors in Computing Systems in Denver, CO, USA May 6-11, 2017
Views: 188 ACM SIGCHI
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. ... At 300 GHz, the corresponding wavelength is 1 mm, and at 30 Hz is 10,000 km. Like all other electromagnetic waves, radio waves travel at the speed of light.Rather, we are talking about the waves that transmit radio signals. The main difference between radio waves and sound waves is that radio waves are a type of electromagnetic wave that can travel when there is no medium, whereas sound waves are a type of mechanical wave that cannot travel if there is no medium.Radio waves travel like light waves. ... They transmit radio waves through space to antennas here on the ground.) Sound travels at approximately 1,100 feet per second (766 miles per hour). Radio waves travel at the speed of light, which is approximately 186,000 miles per second.Microwaves have a range of applications, including communications, radar and, perhaps best known by most people, cooking. Electromagnetic radiation is transmitted in waves or particles at different wavelengths and frequencies. ... Microwaves fall in the range of the EM spectrum between radio and infrared light.
Views: 0 Health Is Wealth
► Get limited Custom Lego sets at http://www.brickwow.com ► More Custom Lego MOCs http://bit.ly/1O0Uzxi ► Get Lego sets at http://amzn.to/2j0X19k ► Buy Custom Lego & Brick Lights @ http://www.artifexcreation.com ► Watch Lego videos on Amazon http://amzn.to/2i0KwZC ► Build Lego in ArtiFex Interactive APP @ http://apple.co/1Jbnpmt Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form. Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form that is usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc.Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum. A radio communication system sends signals by radio. The radio equipment involved in communication systems includes a transmitter and a receiver, each having an antenna and appropriate terminal equipment such as a microphone at the transmitter and a loudspeaker at the receiver in the case of a voice-communication system. Source : https://en.wikipedia.org/wiki/Radio We're a participant in Amazon's Associates Program. This video contain affiliate links, we'll receive a small commission if you click on the product links and it will not cost more when you make a purchase. Please help support us by purchasing Lego sets at http://amzn.to/2j0X19k SUBSCRIBE & Follow us for more! • Facebook http://www.facebook.com/ArtiFexCreations • Twitter http://twitter.com/#!/ArtifexCreation • Flickr http://www.flickr.com/photos/artifexcreation/collections/ • MOC http://www.mocpages.com/home.php/23318
Views: 24451 ArtiFex Creation