A gamma ray Photon creates an electron Positions Pair. If the rest mass energy of an electron is 0.5 MeV. and the total kinetic energy 0.7 MeV, then the energy of the gamma ray Photon must be
So‘rovnoma
- 3.9 MeV
- 1.78 MeV
- 0.78 eV
- 0.16 eV