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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:
'''E = hf'''
where '''f''' is the frequency of the electromagnetic wave and h is Plank's constant and has the numerical value of 6.626*10<sup>-34</sup>[[Joule|Joules]] or 4.135*10<sup>-15</sup>electron volts (eV).
==References==
<references/>
[[Category:Physics]]