A photon of sufficient energy can spontaneously create an electron and positron. This will conserve charge and must conserve energy. What is the minimum energy photon (in MeV and J) that can create an electron-positron pair?
The Attempt at a Solution
I know that the photon must have twice the energy of the electron (or of the electron and positron added together), but I have no idea how to find it. I think I am missing the formula or some simple conversion, help please!