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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 `K.E.` of the electron-position 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

Text Solution

Verified by Experts

The correct Answer is:
B
Energy of `gamma`- ray photon = Rest mass energy + K.E. = 2(0.5) + 0.78 = 1.78 Me V
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