Electromagnetic radiation (EM radiation or EMR) is one of the fundamental phenomena of electromagnetism, exhibiting wave-like behavior as it propagates through space carrying radiant energy. It is emitted and absorbed by charged particles. EMR has both electric and magnetic field components, which stand in a fixed ratio of intensity to each other, and which oscillate in phase perpendicular to each other and perpendicular to the direction of energy and wave propagation. In a vacuum, electromagnetic radiation propagates at a characteristic speed, the speed of light.
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