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Physics
General and Special Relativity
Speed of Light

Can a particle without mass travel at the speed of light?

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2010-09-07 08:23:25
2010-09-07 08:23:25

Yes, a photon may travel at the speed of light.

If it had mass, at the speed of light, its mass would be infinite.

This is impossible, so photons travel at the speed of light and have no mass.

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