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

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0.78 MeV

1.78 MeV

1.28 MeV

0.28 MeV

answer is B.

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Detailed Solution

Energy of γ ray photon =0.5+0.5+0.78=1.78MeV.

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