Find the rest mass energy of electron.

The rest mass energy of electron is

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 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 moving positron and electron both with kinetic energy 1 Me V annihilate with each other and emits two gamma photons. If the rest mass energy of an electron is 0.51 MeV, the wavelength of each photon is ?

A moving positron and electron both with kinetic energy 1 Me V annihilate with each other and emits two gamma photons. If the rest mass energy of an electron is 0.51 MeV, the wavelength of each photon is ?

Find the rest mass energy of a proton in MeV. [m_(p) = 1.673 xx 10^(-27) kg]