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photon , quantum of light

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photon, quantum of light (In French photon) light particle that also shows wave properties (wave-particle dualism) and is emitted when an excited electron returns to its normal state (“quantum leap”). The type of atom (chemical element/compound) is responsible for the impulse energy which the photon receives in the course of the quantum leap. The wavelength of the light is the quotient of Planck’s constant h and impulse.