Under the right circumstances, if a photons energy is above a minimum energy level, that energy can

Question:

Under the right circumstances, if a photon’s energy is above a minimum energy level, that energy can be completely converted into creating an electron–positron pair (a positron is identical to an electron except that it has a positive charge). Recall that the energy equivalent of the electron mass is 0.511 MeV. Determine
(a) The minimum-energy photon required to create such a pair, and
(b) The wavelength of light associated with photons of this energy.
(c) If a photon with twice the minimum energy were used, what would be the total kinetic energy (electron plus positron) of the two particles after their creation?