0 / 1 pts Question 23 A positronium atom (electron + positron) decays, emitting two photons. What are the energies of the photons? 0.256 MeV and 0.256 MeV 0.511 MeV and 0.511 MeV 0.225 MeV and 0.285 MeV 0.511 MeV and 1.022 MeV