A-LevelPhysicsParticle physicsMay/June 2020Paper 4 Q116 Marks
An electron, at rest, has mass m_e and charge –q. A positron is a particle that, at rest, has mass m_e and charge +q. A positron interacts with an electron. The electron and the positron may be considered to be at rest. The outcome of this interaction is that the electron and the positron become two gamma-ray (γ-ray) photons, each having the same energy.
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