What would the world look like if we could see radio waves? - Quora

archived 23 Jun 2020 02:39:16 UTC
5 Answers
Estéban Valle, disciple of science and amateur radio technician
Originally Answered: What would the world look like if we could see radiowave?
This is a wonderfully complex question that involves both physics and biology!
TL;DR: It would be just like looking at things as we do now. Our brain would come up with some new “colors” for us to see things in. Many objects would appear translucent in certain “colors”, almost like glass does now. Objects that emit these waves, like antennas, would appear like light-sources do to us, but our vision would not be “overwhelmed” unless looking at an antenna or highly-radioreflective surface.
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The most important thing to remember as we go through this answer is that visible light and radio waves are both the exact same kind of electromagnetic radiation, they differ only in wavelength (physically how long the waves are). We’ll let the E&M physicists fight over what that actually means, but for us it’s golden.
Many answers state that we would be overwhelmed because “radio waves are all around us”. Well, visible light is everywhere around us, too, and it is much higher in energy than these lower-frequency “radio” waves. Yet, we are very seldom overwhelmed by light unless we look directly at a strong light source like the sun.
That is because we only perceive light when it actually enters our eyes. We can't, for instance, see a laser beam in a vacuum broadside; unless we're looking toward the laser or where it hits some surface, it is invisible because none of those photons enter our eye (we can see laser beams in our atmosphere because the beam hits small dust particles in the air, and that's what we actually see).
We perceive light as it emenates from some source, like the sun or a lightbulb, or as it reflects off of some surface and enters our eye. You only know that chair, or mountain, or wine glass is there because it is reflecting ambient light and some fraction of that scattered light enters your eye. Lower-frequency radio waves (electromagnetic radiation, just like light) wouldn't overwhelm our senses unless we looked directly at a source—an antenna, which presumably would look somewhat like a lightbulb—or saw the waves reflecting off of normal radiopaque surfaces like the ground.
“Radio waves”—colloquially referring to the EM range of 1 Hz to around 5 GHz—have much lower frequencies than visible light and thus longer wavelengths. This would mean that radio waves interact with matter differently which would change the way some things appear to our eyes. For instance, depending on the wavelength we detect, smaller items like a car or a building might seem literally translucent to us—the same way that glass appears transparent under normal light, or the way skin is translucent to X-ray sensors.
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That said, let’s explore what it might actually look like:
This photograph (from Wikimedia Commons) is taken in the near-visible infrared spectrum, at around 800nm, which is just below (longer waves, less energy) what we can see with our eyes—the camera “translated” it for us! This light is basically the same wavelength as visible light, and so most objects will appear normal. But where’s the color?
There we go! This image (also from Wikimedia) of a man holding a trash bag is taken with a device called a thermographic camera. The camera senses radiation in the long-infrared range as low as 14,000 nm (well below visible light, and also much lower than the photograph above), and “translates” that into a photograph for us. Note that at this wavelength, the trash bag is basically transparent, but we can still see the man. In this case, the man is actually acting like a dim lightbulb, and giving off his own “light” in the form of infrared radiation! The color—however exciting it may be—is actually fake. The camera translates intensity of light into different colors to make it easier for us to see it on the screen. Here’s what the same image looks like without the false-coloration:
This image is a pretty good example of what seeing in radio-waves might look like, aside from the fact that this man would be as translucent as the trash bag if we were to go much longer in wavelength.
In black-and-white, you can see that the false color in the image above is in contrast to “natural color” as we’ll see below. Natural color is caused by different wavelengths of light, whereas this color is caused [artificially] by the varying intensity of one wavelength of light. Presumably, if we were able to see radio waves, or other electromagnetic radiation, we would be able to see more than one wavelength at a time, and also the visible spectrum, which our brain would have to process into some sort of sensory experience that we could comprehend. Our brain already does this when it makes color…
What does it mean to see different frequencies of light?
Colors are a product of our biology! They don’t actually exist. Objects of different color are simply emanating or reflecting light of different wavelengths. Longer wavelengths (700nm) appear red to our eyes, and shorter wavelengths (400nm) appear blue. Our eyes contain three types of cone cells, which sense light and enable us to differentiate between the frequencies of light that we see. Each cone cell focuses on “seeing” one specific color range (see above), and passing that information on to our brain. The brain takes all of this information and creates colors as a way to help us differentiate between different objects. There is nothing “inherent” about a specific wavelength that makes it “red”; our biology and culture have just evolved such that we always associate the two. In fact, the primary reason [some] animals evolved to perceive color is to differentiate between things which are safe or dangerous (like poisonous foods or predators).
Many cultures, and different types of animals, already do not percieve colors the same way that we do. This is what “color” vision would look like without the M-cone cell above (image from DePaul University):
That just goes, again, to demonstrate the way that color is only a manifestation of how our brains process the input we receive.
Our eyes can only see between 400 and 700nm radiation! That’s a super narrow range, but our brain already translates that into the entire color spectrum that we know. Just imagine what kinds of colors or feelings our brain would construct if we were able to see a range 50,000 or 100,000 times larger!
That means that the only thing stopping us from seeing “more colors” outside of the visible spectrum is the way our brain would process the additional information. If we had more photoreceptor cells in our eyes that were capable of seeing “radio waves”, our brain would come up with some mechanism to differentiate that sensory input from normal color—there’s no way of knowing what that mechanism would be (new colors we haven’t even imagined), but we might be able to glean some insight from certain species of birds which are able to see into the infrared and ultraviolet spectrum already!
At night, our eye’s rod cells are more sensitive to light, but are not able to differentiate between frequencies. This is why night-vision is black-and-white. If we have only one kind of photoreceptor cells for “radio waves”, then we wouldn’t be able to differentiate between them, and our brain would not sense different “colors” of radio wave. The black-and-white image above shows what that might look like—but keep in mind, that intensity-map would be overlaid on our normal color vision!
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Anyway, that’s a bit of the science that would go into answering your question about what the world would look like if we could see radio waves. I’m no Ph.D., of course, and I invite comment and criticism from people who have more knowledge than I.
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Very different things, depending on the frequency. Keep in mind that visible light lies between 405 and 800 THz which makes the highest end of the visible spectrum just twice as high in frequency as compared to lower end. Highest and lowest ends of that part of the EM spectrum share the same propagation characteristics and interact with matter more or less the same way (of course some materials reflect some wavelengths better than others, that’s why we see object colors).
At VLF/ELF frequencies, we will be swamped by radio waves from natural sources, mostly lightnings. It would be definitely boring, wavelengths are enormous, propagation is both ionospheric skip and groundwave, I believe we will be seeing blurred haze. Probably with some small differences where very big objects are. Powerlines and AC adapters would shine brightly due to their harmonics, so will some household items. Their “light” will be quickly “lost” though as you go away from them, swamped in the atmospheric noise.
At LF/MF frequencies up to 2 MHz, man-made sources will become more prominent and atmospheric noise will go down, household electronics will continue to “shine”, away from longwave/mediumwave transmitters it would be darker, the sky would be darker in the day than in the night due to ionospheric propagation of radio stations. We would likely be unable to notice objects less than several hundred meters in diameter :)
At HF frequencies, the sky would be shining in different colors depending on time of day, due to ionospheric propagation of different man-made radio sources. The higher the frequency, the smaller objects we will be able to recognize. During geomagnetic storms, the sky may look really weird. Some days/nights the sky would be much brighter than others. Also some years in the 11-year solar cycle, the sky will be brighter than others. Also we might be lucky to see the geomagnetic storms of Jupiter :)
At VHF frequencies, we will see FM radio transmitters shining brightly, household computers shining brightly due to leaks of their clock oscillators, we will see flashing airplanes in the sky when they transmit VHF voice and ACARS, we will even be able to see the ISS as it traverses the sky, even during the daytime. We will be able to spot the NOAA and Meteor weather satellites in the sky.
At UHF frequencies, it starts to become messy, we get blinded by TV and cellphone transmitters, cellphones will burn through our eyes, we will also see airplanes in the sky flashing fast (ADS-B transmitters). We will also be able to spot hundreds of low-earth orbit satellites in the sky both day and night-time. The sun is becomming a powerful source as frequency increases (at HF and lower freqs, the ionosphere blocks it and it isn’t really a strong VHF source, but becoming stronger in the UHF part of the spectrum).
At microwave frequencies, it gets interesting. The microwave oven will shine so brightly it would burn our eyes, even though closed and protected by shielding (it always leaks). The wifi will shine so brightly it would blind us. So is bluetooth. We will see leaks from monitor cables and LCD monitors and TVs. We will see even more satellites in the sky. The sun will shine brightly. We will be able to see the moon by its thermal emission which gets more pronounced in this part of the spectrum. At C-band and Ku-band frequencies, we will be able to see the geostationary satellites arc shining in the sky all the time.
At higher frequencies, most of the sources will be from extra-terrestial sources except for some rare man-made electronics. This up to 30–40 GHz where the atmospheric gases start to absorb significantly the EM waves.
I imagine it more or less like that.
P.S sorry for my poor English :)
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Drew Hartley, Television Cameraman Broadcasting at See Linked In (1995-present)
Answered June 15, 2020 · Author has 110 answers and 25.7K answer views
Because RF is an AC wave it’s always going from one direction Ie one polarity to another, so if we could see it’s polarity emitting from a loaded coil CB whip antenna let’s say in colours where Blue is + & Green is- we would see something similar to a Yellow S shape rather than the green colour below that is actually demonstrating a dipole Antenna. I think you you get the idea; though not obviously as clearly defined S which is exactly why we call it a wave.
I should give a picture credit as it’s one I sourced from the internet , but you will realise why I didn’t 😉
RF is an electromagnetic wave E
V is showing the polarity of the voltage V measured in AC Alternating current
But whoa hold on …
Of course we should bear in mind another factor regarding how the waves are produced starting at point source ie a dish, vertical, horizontal or a cell tower.
So the actual shape we would expect to see is not entirely the same because it starts small and expands outward.
I thought about it for a while but the best way I can compare it to is like drops of water bulging out sideways in a figure of eight pattern, until the bubbles can no longer hold in the energy therefore “Pop” releasing the wave this happens on each transient curve of the wave changing its polarity the motion of which expands almost kicks outward pushing the waves forward and getting larger until they are the exact wavelength.
This is where the inverse square law is a key element to our story because the waves now spreading out travelling from point A need to be picked up by a second antenna point B
Thankfully all we have to do is mirror the same idea as the transmission of the wave , because the waves travelling at their own wavelength are now kind of decreased down to the original size by the design of the receiving antenna and the water analogy is reversed almost exactly like playing the picture backwards. That’s why it’s important to have a matched antenna, point B tuned to the correct length of Point A
We haven’t mentioned anything about wether it’s a Full Wave, Half Wave, or a quarter wave antenna ..therefore let me ask you a question!
Is the shape of the wave going to be any different in regards to these other waves ?
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Jonathan Mantle, studied at Bachelor of Business Administration Degrees
Answered August 14, 2016 · Author has 1.7K answers and 1.2M answer views
Originally Answered: What would the world look like if we could see radiowave?
This is a really interesting question.
It basically asks the question about the limits of our senses. In the TV show Battlestar Galactica, one of the characters says
“I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter”.
If we could see radio waves, our sight would be completely swamped. The amount of devices that use radio waves nowadays means that your sight would be totally blocked from seeing anything. You couldn't switch on WiFi, you could listen to the radio, in fact there are radio waves all around you every day. Your sight would be a blur!
That being said, however, we may be able to find a way to sort out the signals. This links into my statement above about the limits of our senses. It is hard to know how the body would be able to sort out the senses as we are based on light, not radio waves.
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1. Imagine being at a fixed point Under the ocean surface, but not too deep (very little wave activity at great depths). You'll see waves of water all around you. It'd be similar for radio waves - but they'd not disperse (disappear) as fast as water waves (tides etc.).
2. You're also surrounded by air waves (winds) all the time. You can't see those, but if throw sufficient colored powder (ideally in an enclosed space), you'll see a few currents. It's a good thing you can't generally "see" air waves (winds) - there's so much it'd just be a permanent distraction. (I'm not denying there'd be Some advantages.)
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