24. Medical physics
A section of Physics, 9702
Listing 10 of 162 questions
An electron, at rest, has mass me and charge –q. A positron is a particle that, at rest, has mass me 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. Calculate, for one of the γ-ray photons: the photon energy, in J energy = J its momentum. momentum = N s State and explain the direction, relative to each other, in which the γ-ray photons are emitted.
9702_s20_qp_43
THEORY
2020
Paper 4, Variant 3
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Questions Discovered
162