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The recoil speed of a hydrogen atom afte...

The recoil speed of a hydrogen atom after it emits a photon in going from `n=5`, state to `n=1` state is (in `ms^(-1)`)

A

4.17 m/s

B

2.19 m/s

C

3.25 m/s

D

4.34 m/s

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A
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