CAIE A-Level Physics A2 24.3.5 The Energy of the Gamma Ray Photons Emitted During the Annihilation of an Questions

Practise calculating the total gamma-photon energy released when an electron and positron annihilate using E = 2mc², checking the particle masses and units.

Exam points

calculate the total energy of gamma photons from electron-positron annihilation using E = 2mc²

[Maximum number: 1]

Positron emission tomography (PET scanning) obtains diagnostic information from a person. The information is used to form an image.

Calculate the total energy released in one annihilation event in (b).
energy =

$\begin{aligned} \mathrm{E}=2 \mathrm{mc}^{2} =2 \times 9.11 \times 10^{-31} \times 3.00 \times 10^{-82} =1.64 \times 10^{-13} \mathrm{~J} \end{aligned}$

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CAIE A-Level Physics A2 24.3.5 The Energy of the Gamma Ray Photons Emitted During the Annihilation of an Questions question 1