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## Homework Statement

I'm having difficulty with part C of this question:

## Homework Equations

## The Attempt at a Solution

Using the above equations I correctly calculated the new wavelength of the photon after the collision and using the equations for the photon energies I calculated the energy of the photon before and after the collision to get the change in energy, which I calculated to be 380 eV (I calculated it a few times at varying degrees of accuracy at around 379.6 but the website rounds it up to 380)

Am I doing anything wrong here? Is there some relativistic stuff that I haven't accounted for or is the answer given simply wrong. I'm just using wikipedia and my textbook and it seems like 380 eV should be correct.

If I get a few people here saying that I haven't done anything wrong then I'll email my tutor and get him to change the answer.

Cheers for any replies.