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When a hydrogen atom emits a photon in g...

When a hydrogen atom emits a photon in going from n=5 to n=1, its recoil speed is almost

A

`10^(-4)m//s`

B

`2xx10^(-2)m//s`

C

`4m//s`

D

`8xx10^(2) m//s`

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The correct Answer is:
c
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