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A Photon is a discrete packet of electromagnetic radiation [1]. It is the elementary exchange particle for the electromagnetic force. The Energy of a photon depends on its frequency and is given by the equation:

where f is the frequency of the electromagnetic wave and h is Planck's constant and has the numerical value of Js (Joules times second) or eV s (electron volts times second).


  1. A French, P Taylor.(1978). A Introduction to Quantum Physics. MIT: CRC Press.