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The recoil speed of a hydrogen atom af...

The recoil speed of a hydrogen atom after it emits a photon is going form n=5 state to n =1 state is ….. m/s.

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The correct Answer is:
C
`E=R_(oo)hc(1-1/25`) momentum of photon emitted is `p=E/C=R_(oo)h(24/25)` Recoil momentum of H atom will also be p. `mv=p`
` v=p/m=((1.097xx10^7)(6.626xx10^(-34))24)/((25)(1.67xx10^(-27)))`
`thereforev=4.178ms^(-1)`
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