In everyday life we use the joule to measure energy. When we consider the energy of individual particles or photon it is often more convenient to use a smaller unit, the electronvolt, eV.
ELECTRONVOLT: THE ENERGY GAINED BY AN ELECTRON TRAVELLING THROUGH A P.D. OF 1 VOLT
What exactly is a photon? this video shows how we can use the particle model, with individual corpuscles of energy, to explain certain properties of EM radiation.
If you want to find out more about the photon then I can highly recommend you listen to this radio show: http://www.bbc.co.uk/programmes/b051vlpf
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