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## Homework Statement

48. If a 6.0 keV photon scatters from a free proton at rest, what is the change in the photon's wavelength if the photon recoils at 90 degrees?

52. A gamma ray of 700 keV energy compton-scatters from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.

## Homework Equations

[tex]\Delta\lambda=\frac{h}{mc}(1-cos(\theta))[/tex]

## The Attempt at a Solution

48. Since the angle is 90 degrees, the change in wavelength should be one compton wavelength. I don't see where the energy of the photon comes into play.

52. Again, I don't see where the energy comes into play.