Definition of radiation?
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physics:the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
biology:
divergence out from a central point, in particular evolution from an ancestral animal or plant group into a variety of new forms.
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Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties. You could also call radiation “electromagnetic waves”.
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