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In a head-on collision of an electron of kinetic energy of 2.044 MeV with a positron...

In a head-on collision of an electron of kinetic energy of 2.044 MeV with a positron at rest, the two particles are replaced by two photons of equal energy. If each photon is traveling at an angles θ with respect to the electron’s direction of motion, What is the energy E, momentum p (you can leave the answer in terms of c) and angle of θ of each photon? (For electron and positron mc2 = 0.511 MeV)

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