When a hydrogen atom going from $n=2$ to $n=1$ emits a photon, its recoil speed is $\frac{\mathrm{x}}{5} \mathrm{~m} / \mathrm{s}$. Where $\mathrm{x}=\left(\right.$ Use : mass of hydrogen atom $\left.=1.6 \times 10^{-27} \mathrm{~kg}\right)$
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