Question:
When a photon is emitted by a hydrogen atom, the photon carries a momentum with it. Calculate the momentum carried by the photon when a hydrogen atom emits light of wavelength $656.3 \mathrm{~nm}$. With what speed does the atom recoil during this transition? Take the mass of the hydrogen atom $=1.67 \times 10^{-27} \mathrm{~kg}$. Find the kinetic energy of recoil of the atom.
Solution:
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