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- Homework Statement
- A photon with wavelength (lambda) moves towards a free electron which moves with speed u in the direction of the incident photon (see figure). if the photon disperses at angle theta, show that the wavelength of the dispersed photon is: (see picture below)

- Relevant Equations
- Relativity Formulas, Doppler Effect, etc

Hello! I do not understand how to prove the exercise. I have searched all over but I have found no hints on how to get started. Can anybody help me?