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Q.

A gamma ray photon creates an electron-positron pair. If the total kinetic energy of the electron-positron pair is 0.78 MeV, the energy of the gamma ray photon is: (given the rest mass energy of electron = 0.51 MeV)

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a

0.27 MeV

b

0.78 MeV

c

1.29 MeV

d

1.80 MeV

answer is D.

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Detailed Solution

The energy of gamma ray photon = (rest mass energies of positron and neutron) + (total kinetic energy of electron-positron pair)

E = 0.51 + 0.51 + 0.78 = 1.80 MeV.

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