The reaction e⁺ + e^- $\to$ $\gamma$ + $\gamma$ A)describes the annihilation of a positron. B)has a large probability of occurrence only if the positron is at rest or nearly at rest. C)requires two photons moving in opposite directions to conserve linear momentum. D)is an electron-positron reaction. E)All of these are correct.

Question

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A) The reaction involves the annihilation of a positron through the interaction with an electron. This process is described in the first term of the reaction, where eS1U1P1 and eS1U1P1-S1S1P0 represent the incident and scattered positrons, respectively, and S1S1P0 and S1U1P1 represent the incident and scattered electrons, respectively.

B) The reaction has a large probability of occurrence only if the positron is at rest or nearly at rest, because the annihilation process requires the positron and the electron to be in very close proximity to each other in order to interact.

C) The reaction requires two photons moving in opposite directions to conserve linear momentum, because the annihilation process produces two photons that carry away the energy and momentum of the electron-positron pair. These photons have equal energy and are emitted in opposite directions, in order to conserve momentum.

D) The reaction is indeed an electron-positron reaction, where the positron and the electron interact and annihilate each other, producing two photons as the final products.

Therefore, all of these choices are correct, and the best answer is E.

The Reaction E+ + E- →\to→ γ\gammaγ γ\gammaγ A)describes the Annihilation of a Positron

The Reaction E⁺ + E^- $\to$ $\gamma$ $\gamma$ A)describes the Annihilation of a Positron