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Photon is not a particle at all. It is having zero rest mass. The colour of light is mainly due to variation in the frequency nu. The energy of a photon is given by the formula

E= h nu. Here nu is the frequency of the radiation. As frequency changes colour changes. For violet it will be the highest and for red its frequecy will be the lowest.

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Q: Light is a particle called photon Why the velocities are different?
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