Review Compton scattering.
You will find the equation that you need there.
Gamma rays of photon energy 0.511 MeV are directed onto an aluminum target and are scattered in various directions by loosely bound electrons there.a) What is the wavelength of the incident gamma rays?
b) What is the wavelength of the gamma rays scattered at 90 degrees to the incident beam?
c) What is the photon energy of the rays scattered in this direction?
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