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A gamma ray photon creates an electron p...

A gamma ray photon creates an electron positron pair. If the rest mass energy of an electron is 0.5 MeV and the total kinetic energy of the electron positron pair is 0.78 MeV, then the energy of the gamma ray photon must be

A

0.78 MeV

B

1.78 MeV

C

1.28 MeV

D

0.28 MeV.

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