Nuclear And Radioactivity Test - 2

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Nuclear And Radioactivity Test - 2

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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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