An electron and a positron anihilate with equal and, Ask an Expert

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An electron and a positron anihilate with equal and opposite momenta and become two photons: e^- + e^- → 2 photons. Both the electron and the positron have mass me and momentum of magnitude mac.

(a) Explain why the electron and positron cannot annihilate to become a single photon.

(b) What are the magnitudes of the momenta of the photons?

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