The recoil speed of hydrogen atom after ...

The recoil speed of hydrogen atom after it emits a photon in going from `n = 2 state to n = 1` state is nearly `[Take R_(oo) = 1.1 xx 10^(7) m and h = 6.63 xx 10^(-34) J s]`

`1.5 ms^(-1)`

`3.3 ms^(-1)`

`4.5 ms^(-1)`

` 6.6 ms^(-1)`

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