An x-ray photon is scattered from a free electron (mass m) at rest. The wavelength of the scattered photon is λf, and the final speed of the struck electron is v a) What was the initial wavelength λ of the photon? Express your answer in terms of λf, v, m, and appropriate constants. (Hint: Use the relativistic expression for the electron kinetic energy.) b) Through what angle ϕ is the photon scattered? Express your answer in terms of λf, λ v, m, and appropriate constants.

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