(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

When considering conservation of energy and momentum in the collision between a photon and an electron (in Compton scattering for example), is it reasonable to worry about 'stationary' electrons?

3. The attempt at a solution

From what I can recall the derivation of the Compton scattering formula was based on a stationary electron. But how is this justified? Are electrons in stationary atoms always stationary?

Thanks for any help!

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# Stationary electrons?

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