| phenomenon by which energy in the form of electromagnetic waves or photons emanates from a source and is transferred through space
Note 1 to entry: The term “electromagnetic radiation” is also used for the electromagnetic waves or photons produced (see IEV 705-02-01).
Note 2 to entry: The physical concepts of photons and electromagnetic waves are used to describe the same phenomenon of transmission of radiant energy in different ways, depending on the nature of the interaction of the energy with the physical world (wave-particle dualism).
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