First slide

Energy released in nuclear reactions -Q-value

Question

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

Easy

A

0.78 MeV
B

1.78 MeV
C

1.28 MeV
D

0.28 MeV

Solution

Energy of gamma photon $= (2 \times 0.5 + 0.78) M e V = 1.78 M e V$

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