The rest mass energy of electron or positron is (in `MeV`)

The rest mass energy of electron is

Find the rest mass energy of electron.

The rest energy of an electron is.

The rest energy of an electron is.

One Mev positron encounters one MeV electron travelling in opposite direction. What is the wavelength travelling in opposite direction. What is the wavelength of photons produced, given rest mass energy of electron or positron =0.512MeV ? Take h=6.62xx10^(-34)J-s .

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.