Electromagnetic wave/Definition

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https://en.citizendium.org/wiki/index.php?title=Electromagnetic_wave/Definition&printable=yes
A definition or brief description of Electromagnetic wave.

A change, periodic in space and time, of an electric field E(r,t) and a magnetic field B(r,t); a stream of electromagnetic waves, referred to as electromagnetic radiation, can be seen as a stream of massless elementary particles, named photons.

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