20. A certain photon has the same momentum as a proton moving at speed 5.00 × 106 m/s. (This is slow enough that you do not need relativity for the proton.) The proton mass is 1.67 × kg. What is the energy (in MeV) of the photon that has the same momentum as the proton?
(A) 15.6
(B) 1.40
(C) 0.654
(D) 0.112
(E) 8.63

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