Question: (a) A proton is moving at a speed much slower than the speed of light. It has kinetic energy K1 and momentum P1. If the

(a) A proton is moving at a speed much slower than the speed of light. It has kinetic energy K1 and momentum P1. If the momentum of the proton is doubled, so P2 = 2p1 how is its new kinetic energy K2 related to E1?
(b) A photon with energy El has momentum P1. If another photon has momentum P2 that is twice P1 how is the energy E2 of the second photon related to E1?

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