In physics , electromagnetic radiation EM radiation or EMR refers to the waves or their quanta , photons of the electromagnetic field , propagating radiating through space, carrying electromagnetic radiant energy. Classically , electromagnetic radiation consists of electromagnetic waves , which are synchronized oscillations of electric and magnetic fields. In a vacuum, electromagnetic waves travel at the speed of light , commonly denoted c. In homogeneous, isotropic media, the oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave.
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