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A photon has a momentum of 10 MeV/c, where c is the speed of light. What is this

1. A photon has a momentum of 10 MeV/c, where c is the speed of light. What is this photon’s energy?

 

For a photon, energy equals momentum times the speed of light: (10 MeV/c) × c = 10 MeV.

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