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## Homework Statement

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?

## 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!