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A Photon is a quantised 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 (in Joules) depends on its frequency and is given by the equation:
A Photon is a quantised 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 = 6.626*10^-34 (Planks constant).
where '''f''' is the frequency of the electromagnetic wave and h is Plank's constant and has the numerical value of 6.626*10^-34 J*s or 4.135*10^-15 eV*s.