Find recoil speed (approximately in \( \mathrm{m} \mathrm{s}^{-1} \) ) when a hydrogen atom emit...

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Find recoil speed (approximately in \( \mathrm{m} \mathrm{s}^{-1} \) ) when a hydrogen atom emits a photon during the transition from \( n=5 \) to \( n=1 \)
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