Also, why you can produce radio waves with a simple amplifier circuit and a piece of wire, but need special devices like an LED or a discharge tube to produce light?
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From Pepsi to chocolate, from pasta to kebab, there are many types of food.
You can’t eat pasta with a straw, but would work with Pepsi.
Electromagnetic waves interact with the environment based on their wavelenght, and can be very different one another like foods can be.
For each type, there’s a specific behavior, therefore a specific set of tools that work with it.
You can easily make a long wave with a “slow”instrument like an electric circuit, like radio, tv, and so on. It’s not a difficult frequency to artificially make with electricity, then you transmit the wave by sending the electric signal to the antenna. The antenna ups and downs in electric charge will induce a wave in the electromagnetic field.
Light is in a wavelenght so small that bounces on most things surface, but big enough to not penetrate. Can be detected by special means. For example our eyes can electrochemically sense it. Cameras can electrically sense it. Photo film does chemically sense it. You can make light by glowing stuff, hence you don’t directly make light, you excite materials that emit light when excited. As the wave is too short to artificially make it with a circuit and antenna. Nice that light bounces on stuff because it allows mirrors and lenses to work.
Even tighter waves like X-ray are so tight they can go through materials. You can’t pick ‘em up with human body sensing, they go through it. However they behave like light in glass, with some metals. So we can use very strange detectors or emitters, connected to metal plates/wires that capture and transmit the wave like a mirror or optical fiber would with light.
It’s all about the wavelenght, and what that wavelenght is able to interact with. I overly simplified three spectrums, but there are so many with so many properties.
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