Electromagnetic Spectrum: Radio Waves

/ sciencereason ... Science@NASA: 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.
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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.
• imagine.gsfc.na...
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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.
• en.wikipedia.or...
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[@Bobbiethejean]

I don't understand how people can ~not~ find this fascinating.

[@ChrissyboyH44]

If you were on the outa regions of our solar system with a pretty much standard FM radio.. you would just about still recieve transmisions from Earth, altho what you would generally hear would be a 'wooshing' sound due countless stations on the same frequencies. Further out, reception would fade behind static. However, if you have a radio telescope of infinite size (if there was such a thing) and if you could travel lightyears in space, then you could hear transmissions from many years ago.

[@lostbuffalo]

@kurentmalik Another thing not widely known about Tesla is that he invented the transistor, the diode, the field effect transistor and on and on. Study his work in vacuum tubes. These components are developments of Tesla's vacuum tubes by simply replacing the vacuum in the tube with a semi permeable layer of silicon between the cathodes gates and anodes. the architecture and function of ic components is identical to Tesla's vacuum tube patents right down to the rare earth elements used.

[@LynnColorado]

What a lucky group of human beings we are to be able to learn and share this kind of information. Thank you!

[@christopher2206]

It's partly true. Don't forget about the rest of physics when listening to someone talk about a part of physics.

[@MrTerminalZ]

3:26 and 3:29 were the sound affects of the hover disk jump from Shadow the Hedgehog.

[@skindizzie2949]

LOL

[@chrisofnottingham]

@EclecticSceptic It isn't so much that a radio wave is stopped by things, its that the wave becomes more and more spread out until any one part of it is too small to detect. Its like a ripple on a pond. Even if the pond were a frictionless fluid, one wave is spread out over the circumference of an ever increasing circle but it still only contains the original energy, thus it gets forever smaller until it is no bigger than other random noise.

[@MonsieurRondu]

The problem is, people think that because they aren't good at science, they shouldn't be bothered with developing an interest in it. But you know what? I'm pretty fucking interested in music, but just because I can't play it doesn't mean I'm going to dismiss it as something "boring".

[@eleminatus]

@Inwarwetrustful its not a sonar system. We dont send radio waves to planets and back. Its planets (or rather objects of space) that emit radio waves and we detect them!

[@luckystrke]

Since you touched upon it, you should probably explain that radio waves used for transmission of radio stations, use the waves as a carrier for audio information. Thats why you may lock on to just one frequency of radio waves, but still receive the whole audible spectrum.

[@kingsmithgaming8726]

So they are like really quite sounds that antennas are able to pick up on and make them loud enough for us to hear?

[@Israel220500]

No. They are electromagnetic waves that travel much faster than sound. The antennas pick this signal and transmit to a device that decodes this signal into something else. Maybe it turns it into images like in a TV, or sound like in a radio, or even digital information, like in wireless internet.

[@lostbuffalo]

@kurentmalik Because they are talking about electromagnetic waves. Tesla called them Ether waves... same thing different nomenclature so if you don;t mention Tesla, you don't have to talk about ether. The word Ether to contemporary scientists is like the word spirit. its a word from a stupider time (in their estimate) and they think if they say ether they will lose credit. To avoid this they just avoid speaking of Tesla.

[@MyDavidsun]

Interesting video!

[@zarkoff45]

@AnnaLang17 You didn't understand my question. Is the ~30 million km wavelength useful in radio astronomy. Seeing as it required using the Earth's magnetic field that would imply that the Earth's field could be used as a radio telescope, but to what degree.

[@zachiramcclinton414]

Love all videos

[@nickoloes]

Nikola Tesla need sto be given more credit for the radio. Great man.

[@emiliopersichilli4628]

Great storytelling, great video. Thank you

[@DVampire22]

I really enjoy this channel. Theres so much cool info to watch.

[@Mr.Robert1]

Watching this today in 2004. Understanding that NASA is sending a signal to Voyager 1 just now leaving our solar system. At that speed it's going to take 45 minutes round trip for the instructions to reach Voyager and make it back to NASA. 300,000,000 Meters Per Second.

[@franzjanganieribarbosa4114]

Very good! The best explanation about the subject that I found so far.

[@XorLavir]

I also want to mention Alexander Stepanovich Popov en. wikipedia. org/ wiki/ Alexander_Stepanovich_Popov was the first who demonstrated the PRACTICAL application of electromagnetic (radio) waves, although he did not apply for a patent for his invention. In 1894 he built his first radio receiver. Guglielmo Marconi was a rich businessman, who managed to create business from it, monopolizing invention. That's why 100 hundred years of radio was celebrated in 1895 and not in 1896.

[@DJfractalflight]

3:44 Saturn really having trouble hocking out a loogie there at the end. Third time’s the charm!

[@inquiry10]

Simply amazing

[@zarkoff45]

CAN ANYONE ANSWER THIS QUESTION: What is the longest radio wave we can currently detect? Can we detect a radio wave over a hundred miles long? A thousand miles long?

[@EndorJedi985]

2

[@summerlandero4466]

anyone here knows the pros and cons

[@adamwigley9738]

Umm. Is it an inside joke relating to a question on homework?

[@AnnaLang17]

@zarkoff45 We can't use the field AS a telescope but it can induce an alternating current and voltage for some. The wavelength is important, but the size of the telescope and the efficiency of the receiver for amplifying signals is as equally important. Cosmic RW can be very weak, so it's hard to analyze and capture them from ground-based telescopes especially if they have longer wavelenghts. But if we do, we can use and study their composition, velocity etc and learn about their destination.

[@ChrissyboyH44]

I have a radio ham question which I thought someone may be able to answer here. No worries if not. 🙂 Basically, if hypothetically you were able to build a gigantic radio receiver (as in a massive radio dish a few miles wide) and take it far up into space, would the noise level also increase with the size of the dish due to "more noise" being received (thus having to "cool down" the receiver), or would the background noise level temperature stay the same, regardless of the size of your antenna/receiver? I'm guessing the noise level stays the same, as otherwise large aerials and radio dishes would be rendered pointless. When you extract an FM radio antenna, the signal of the desired radio station gets stronger, but the noise level doesn't increase. Even the smallest of receivers still pick up background static, surely at the same uniform temperature. I am thinking about land based FM radio signals being received from from far out in space with a giant dish, and surely if the background noise level is at a constant temperature, then all that matters is that you receive enough "photons" from the desired radio station back on Earth with a large enough receiver to pick up the desired signal? ...

[@edenisashahinas1395]

it helped thanks

[@flexairz]

Doubling the distance from a transmitter means that the power density of the radiated wave at that new location is reduced to one-quarter of its previous value. Basically this means that it will be very difficult to hear our transmissions.

[@gamehunter56]

very cool

[@robertwc82]

@zarkoff45 now your tripping me out. like when i think about, how atoms were the fundamental building blocks but now they say quarks are the building blocks of atoms. what if the complexity is infinite, what every thing is built by smaller components? seems impossible, but seems just as impossible to be finite to me

[@TheSanovita]

Great information, thanks

[@Curas1]

ERROR? ! I'm not sure if this is true but I heard someone say on a science show that in fact ALL our radio and tv broadcasts fade into the cosmic background static at about 2 lightyears. NO radio signal has ever reached another star, EVER! Am I wrong ?

[@AnnaLang17]

@zarkoff45 Yes, we can. Didn't you watch the video? Radio waves can be longer than Earth's diameter, which is around 8000 miles. As far as I know, the longest radio wave detected is 30.5 million km or 18.9 million miles. But like julshz said there's no upper limit.

[@AmojiBear]

science is interesting. I like it.

[@Maya-xs8pf]

+Amoji Bear me too

[@mongol33t]

nah it's nothing but brain wash.

[@Sanngot]

Oooooooooh! is this going to become a series that is dedicated to every form of electromagnetic wave? This could be fun to watch, if that is the case! B)

[@TheSkaterjoe123]

@Prestallar lol

[@knsureshkumar8181]

Wow.its a informative c video about electro magnetic spectrum

very informative , ... thanks

[@Juxtaroberto]

@liquidminds well, they'd have to be within a hundred light years from us. also, new evidence suggest that at vast distances, the message "deteriorates", so that all they'd get is static.

[@azmanabdula]

@broodyart trippy.......go on.........are you saying the wavelength effects speed? "I just think that the length vs expansion would be more efficient?" peace dude

[@AnnaLang17]

Oh and I think atmosphere, magnetosphere science involves the study of ELF, you should look it up.

[@thenightbringer9770]

Hello, I was very young went this was written

[@MrKorrazonCold]

I completely agree with you!

[@321hossain]

yes i love all the programmes you presen ,but it is hard to focus on the ditails,because of loud or un nesseccry music in the back grround thanks .

[@andreeaweed]

Lovely video

[@VCSandARM]

Very nice info, thanks

[@Kazath]

Flawless.

[@sleepwalker29]

Farthest a radio wave can travel is 100 miles UHF/VHF, AM. So no radio wave can reach the moon, or space to cumminicate with astronauts.

[@NativeVsColonial]

Sir, I have a question Does mobile tower frequencies travels differently during the day and the night?

[@shadowmax889]

It is a shame that in sapace soon or later they will not hear us because of digital transmitions wich use a lot less energy than analogic transmitions

[@zer0zutnamadav272]

thank so much!! Love

[@newcomer4220]

Great

[@juanpedraw4245]

What's the exposure limit for radio waves?

[@DJxSGGxNeo]

Very Danger.

[@FarceTheory]

Just to make things clear. First there was Faraday, Then Maxwell, After witch in 1887 Hertz performed his first successful Radio experiment. At the same time Tesla was already performing X-ray experiments.

[@EclecticSceptic]

@chrisofnottingham Thank you, that was a good explanation. I was picturing the radio wave travelling like so: Imagine the pond. The wave is travelling along like a snake, straight forward, except it is undulating up-down not left-right. I should have imagined it travelling like a sound-wave, or your ripple in the pond.

[@azmanabdula]

@DevionB yes but isnt the SETI-project a private project?

[@kiddhitta]

SCIENCE FTW!!!!!!

[@asnr6]

interesting one!!!!

[@Kazath]

@Inwarwetrustful I'm pretty sure they registered radio waves that came from the quasar, in essence they discovered it through radio waves.

[@raydok15]

nice video

[@ohyeah2215]

Yo are you still alive????

[@somejackball]

i'm on a mexican, radiiiooo.... i'm on a mexican, woah ohhh, radiiiooo... radio, radiiooo...

[@part2themovie]

@baeronautics the possibility of extra solar/galactic intelligent life existing increases proportionally with the probability of achieving near light speed travel - Anthony Alexander

[@MrArty303]

not bad, it's just awesome!!!

[@zarkoff45]

@AnnaLang17 Thanks for your input. That was impressive. I know, Google is my friend also, the reason I ask such questions is to stimulate people's curiosity.

[@stablest9179]

Video: blah blah blah from the suns corona blah blah blah Quarantine people: THE SUN HAS CORONAVIRUS! EVERYONE RUN!

[@kurentmalik]

@lostbuffalo on everything, I agree!

[@adamwigley9738]

Was this before you could reply on comments? Whether it was or wasn't, I was curious to see what you agreed with so I filtered the comments by date and scrolled til I found lostbuffalo. I also agree with him

[@baeronautics]

@part2themovie scientists are now working to create a portal between two dimensions or galaxies it would be way easier than working on the speed of light

[@shadowmax889]

is ashame that in sapace soon or later they will not hear us because of digital transmitions wich use a lot less energy than analogic transmitions

[@thegeffc]

love the video man

[@thegoodnoodle2896]

?

[@EclecticSceptic]

@DevionB Yes I know about the expanding universe and dark matter but I want to know what it is the stops the radio wave. Ok, so the universe isn't a perfect vacuum. Well what is in the universe that stop the radio travelling uniformly ad finatum?

[@lundqvjrl9359]

In what medium does radiowaves project itselfe trough?

[@ghenam7281]

Wow... nothing about Tesla... sad, NASA, sad...

[@ash-qd3pl]

Yes! Marconi is so overrated. It just makes me sad how they credited him in the beginning of this video.

[@terrymac9570]

G M nutty Nick was so misguided , yea he had some great ideas but he was just joining the dots from others before him

[@FreaRobinson]

aaayyyyyeeeee!!!!🙌 You keep me motivated 💪 Yourvideos are amazing 🙌

[@kurentmalik]

because there are millons of research that can be done on this and not just yours (so we cant call it research any more but rather belife) which research do you recommend?

[@broodyart]

I don't know the answer to this. But is anyone trying to detect ir., uv., or gamma, x-ray variations for signals that aren't natural? It would make more sense to me to transmit signals in light. [ Like the little toy balls that hang on strings ] Through the light, pulses should be able to be transmitted, I'm quessing, possible gamma range? But have we made such recievers, that can detect something that fast? I just think that the length vs expansion would be more efficient?

[@EclecticSceptic]

@chrisofnottingham Ahh, right. Ok let me think about that, thank you. Yes I know there is no 'end of the universe', I was just using that phrase for the sake of the question.

[@gamehunter56]

@Bobbiethejean i know right

[@capbiumteoi7448]

nice channel name

[@boriskaragiannis]

how radio waves travel in the void of space? since no medium to vibrate exist

[@ickederen114]

I just wanna know how them signals went by earth curve to other continents before satellites?

[@TheZafootz]

Agreed....

[@ch0vits]

Where can i find guys the episode 2 of this?

[@Dyslexic-Artist-Theory-on-Time]

Thanks! We seem to have a Universe of electrical potential of continuous creations continuously coming into existence photon by photon with the flow of EM fields within an infinite number of ref-frames. This is a universal process from the largest object to the smallest creature all will create their own ref-frame their own future. Even you as you respond to this comment your action will be relative to the electrical activity in your brain within your own created ref-frame.

[@gothatfunk]

more! more! more!

[@ohyeah2215]

Do you remember this comment?

[@gothatfunk]

@@ohyeah2215 nope. don't remember the video either.

[@BigMTBrain]

@liquidminds - Any intelligence capable of detecting and deciphering such a system is also capable of deducing that we are like them; creatures on a planet orbiting a sun.

[@EthanBCWEntertainment]

2:2 The earth looks happy

[@EclecticSceptic]

Does a radio wave travel in the direction it is radiated indefinitely until it bounces off something? What does it bounce off, and would a radio wave radiated from Earth continue travelling to the end of the universe?

[@manualLaborer]

I just come here for the 20 second intro because I'm immortal and enjoy wasting my time.

[@lawsonguy75]

Kinda weird how this video was made exactly 8 years before today's events.

[@alexnecula9132]

I saw the Stanciu ball!

[@AnnaLang17]

@zarkoff45 Aw really? I'm proud of you more than I'll ever be of my own children. And I thought I was wasting my time to explain this to you. Screw internet.

[@thegoodnoodle2896]

you know that you can just reply... sending the person an instant message asking them to reply or at least read you response right?

[@Dawitness11]

Check this out: In the bible it talks about the heavenly bodies(the plants) speaking or something about there voice. at the end of this video we heard Jupiter's voice.

[@Porton200]

i've heard stories of people who have metal in their mouth or on their body and drive past a radio station.... they hear the music.

[@Zavarkinas]

02:26 how the heck it goes like this if radio waves always go straight

[@PIX-HUGEIFY]

lol, It is due to the refraction of the wave as not all places in the atmosphere are the same optical density so the wave will speed up / slow down and "bend" away or towards the normal when the optical densities it passes through are different

[@peterhoebarth4234]

@@PIX-HUGEIFY no, line of sight, stupid troll.

[@PIX-HUGEIFY]

@@peterhoebarth4234 that's quite a stupid reply😂

[@lolicunt5492]

Marconis wave already passed vega and AMD still didn't release it.

[@133faceman]

Cant get my head round radio waves because all i associate it with is the radio and not what it is which is a part of ems.

[@snigdhachakraborty9425]

Then what did J.C Bose discovered

[@kousand9917]

1:50 rip ;-; I cry everyday

[@venkatpatil8459]

nice

[@ideagirlconsulting]

posted your interesting video on my writers blog

[@omarpungo5247]

so its a big phone to call home. ET would say ...PHONE HOME haha

[@sicktoaster]

Real original.