To produce an electron-position pair, the minimum energy of `gamma`-ray photon must be

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 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

A gamma - ray photon is emitted

A 5 xx 10^(-4) Å photon produces an electron-positron pair in the vincinity of a heavy nucleus. Rest energy of electron is 0.511 MeV . sIf they have the same kinetic energies, the energy of each paricles is nearly

A 5 xx 10^(-4) Å photon produces an electron-positron pair in the vincinity of a heavy nucleus. Rest energy of electron is 0.511 MeV . sIf they have the same kinetic energies, the energy of each paricles is nearly

In accelerator experimetn on high energy collisions of electrons with positrons, a certaind event is interprected as annihilation of an electron-position pair of total energy 10.2 BeV into two gamma-rays of equal energy. What it the wavelength associated with each gamma-rays ? (1BeV=10^9 eV) .