Question: A photon with energy E is emitted by an atom with mass m. which recoils in the opposite direction. (a) Assuming that the motion of

A photon with energy E is emitted by an atom with mass m. which recoils in the opposite direction.
(a) Assuming that the motion of the atom can be treated non-relativistically, compute the recoil speed of the atom.
(b) From the result of part (a), show that the recoil speed is much less than c whenever E is much less than the rest energy me' of the atom.

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