what’s is radiation and does everything emit radiation?
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Radiation is somewhat self defining. It is something that radiates. There are two broad categories: particle and wave. Wave is most commonly in the form of electromagnetic radiation. It varies from extremely long wavelengths to extremely short. Visible light is several hundred nanometers in wavelength. All matter emits electromagnetic radiation. Usually in the form of infrared. Particle radiation is when the matter shoots of a particle with mass. An example is beta radiation. Beta radiation is a high energy electron.
You are constantly exposed to radiation. Most of it is harmless. Your home wifi uses radiation in the form of radio waves. There is an extremely low level of more dangerous types of radiation as well. Our bodies have natural defenses to protect against it, skin being the main one.
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