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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 0.5MeV and the total KE 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

1.28Mev

D

0.28MeV

Text Solution

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The correct Answer is:
B
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