Question: A gamma-ray photon scatters off a free proton (initially at rest) at an angle of 45o. The wavelength of the scattered light is measured to

A gamma-ray photon scatters off a free proton (initially at rest) at an angle of 45o. The wavelength of the scattered light is measured to be 6.20 x 10-13m.
(a) What was the energy of the incoming photon?
(b) How much kinetic energy did the proton receive? (You may need to carry an extra figure or two in your intermediate answers.)

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