Physics

Problem

An electron with kinetic energy 2.00 MeV collides head-on with a stationary positron and they annihilate into two photons of equal energy. The energy of each photon is closest to a)

1.256\,\text{MeV}

0.511\,\text{MeV}

1.511\,\text{MeV}

2.000\,\text{MeV}

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