A beam of gamma rays of energy 1.00 MeV are aimed at a set of freely moving gold particles. The gamma rays reflected back have an energy of 0.2035 MeV. How is this result consistent with the model of a gamma ray reflecting from an isolated electron initially at rest?
The Attempt at a Solution
I've tried a few ways using Compton scattering but to no avail.
Determining the momentum of the gamma ray.