Radiation is produced by self-generated emanation of a stream of electromagnetic rays in nuclear decay.
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Radiation is formed by energy given off by matter in the form of rays or high-speed particles. Unstable nuclei in an atom may emit energy, and this emission is what is called radiation.
Radiation is energy that is transmitted in the form of rays, waves or particles. Bonfires give off light and heat radiation.
Light is the most common form of electromagnetic radiation that you see in your daily life.
Background radiation come from black body radiation which is mostly infrared and microwave. Background radiation is not harmful at all. Fear from background radiation come from confusion of the word radiation where we mostly concern nuclear radiation, but light is also a form of radiation and we live within the bright day light on a normal basis.
Energy transfered in the form of electromagnetic waves is classified according to wavelength of the radiation. Radio waves, microwaves, infrared radiation, visible light, ultraviolet light, X-rays and gamma rays are all forms of electromagnetic radiation.
Yes, visible light makes up the middle region of the Electromagnetic spectrum. Therefore, light is a form electromagnetic radiation.