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Line 1: − A Photon is a discrete packet of electromagnetic radiation.<ref>A French, P Taylor.(1978). A Introduction to Quantum Physics. MIT: CRC Press.</ref> 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:+ − − <math>E = hf</math> − − where ''f'' is the frequency of the electromagnetic wave and ''h'' is Planck's constant and has the numerical value of <math>6.626\times10^{-34}</math>Js ([[Joule]]s times second) or <math>4.135\times10^{-15}</math>eV s (electron volts times second). − − − − ==References== − <references/> − − [[Category:Physics]]
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#REDIRECT[[Photon]]