An incident x-ray photon is scattered from a free electron that is initially at rest. The photon is scattered straight back at an angle of 1800 from its initial direction. The wavelength of the scattered photon is 0.0830 nm.
(a) What is the wavelength of the incident photon?
(b) What is the magnitude of the momentum of the electron after the collision?
(c) What is the kinetic energy of the electron after the collision?