what is a photon?????
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The photon is a type of elementary particle. It is the quantum of the electromagnetic field including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. Photons are massless, and they always move at the speed of light in vacuum, 299792458 m/s.
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A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light.
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