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 `K.E.` of the electron-position pair is `0.78 MeV`, then the energy of the gamma ray photon must be.
A. 1.78
B. 0.28
C. 1.28
D. 0.14

Answer 1

Correct Answer - A
`E_(gamma)=2(E_(k)+E_(0))`