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Answer to Question #14881 in Quantum Mechanics for khalid Chishti

Question #14881
what is a photon?
Expert's answer
Under the photon theory of light, a photon is a discrete bundle (or quantum) of electromagnetic (or light) energy. Photons are always in motion and, in a vacuum, have a constant speed of light to all observers, at the vacuum speed of light (more commonly just called the speed of light) of c = 2.998 x 108 m/s.

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