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If a photon of wavelength 0.04250 nm strikes a free electron
and is scattered at an angle of 35.0 from its original direction, find
(a) the change in the wavelength of this photon; (b) the wavelength of
the scattered light; (c) the change in energy of the photon (is it a loss or
a gain?); (d) the energy gained by the electron.

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