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.A. `4.718 m s^(-1)`B. `7.418 m s^(-1)`C. `4.178 m s^(-1)`D. `7.148 m s^(-1)`

The recoil speed of a hydrogen atom after it emits a photon is going f

1.	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.A. `4.718 m s^(-1)`B. `7.418 m s^(-1)`C. `4.178 m s^(-1)`D. `7.148 m s^(-1)`
Answer» Correct Answer - C `E = R_(oo) hc (1 - (1)/(25))` Momentum of the photon emitted is, `p` `m v = p` `(p)/(m) = ((1.097 xx 10^(7)) (6.626 xx 10^(-34)) 24)/((25) (1.67 xx 10^(-27))) = 4.178 m s^(-1)`

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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.A. `4.718 m s^(-1)`B. `7.418 m s^(-1)`C. `4.178 m s^(-1)`D. `7.148 m s^(-1)`

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