An isolated hydrogen atom emits a photon of \( \mathrm{P} \) \( 10....

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An isolated hydrogen atom emits a photon of
\( \mathrm{P} \)
\( 10.2 \mathrm{eV} \) as shown in the figure. Calculate the recoil
W
momentum of the atom.
(1) \( 5.44 \times 10^{-27} \mathrm{~kg} \mathrm{~ms}^{-1} \)
(2) \( 1.67 \times 10^{-27} \mathrm{~kg} \mathrm{~ms}^{-1} \)
(3) \( 3.22 \times 10^{-27} \mathrm{~kg} \mathrm{~ms}^{-1} \)
(4) \( 4.33 \times 10^{-27} \mathrm{~kg} \mathrm{~ms}^{-1} \)
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