Question

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Explain the jumps you can observe in the photoelectric cross section for lead below 10 10 10 1. 10 10 10 10 Photon energy [MeV) Figure 1: The photoelectric cross section for lead for incoming photons with energy ranging from 10 kev to What is the difference between Compton scattering and Incoherent scattering? 2p 2. For what energies and atomic number do you expect the difference to be largest? Wh Explain why the two annihilation photons from a positron-electron annihilation event usually travel in almost opposite directions Why does the triplet production (pair production in an electron field) have a much higher threshold then the pair production in a nuclear field? lp

Answer 1

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