When a hydrogen atom, initially at rest emits, a photon resulting i...

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When a hydrogen atom, initially at rest emits, a photon resulting in transition \( \mathrm{n}=5 \rightarrow \mathrm{n}=1 \), its recoil speed is about
\( \mathrm{P} \)
(A) \( 10^{-4} \mathrm{~m} / \mathrm{s} \)
(B) \( 2 \times 10^{-2} \mathrm{~m} / \mathrm{s} \)
(C) \( 4.2 \mathrm{~m} / \mathrm{s} \)
(D) \( 3.8 \times 10^{-2} \mathrm{~m} / \mathrm{s} \)
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