A hydrogen atom is initially atrest and ...

A hydrogen atom is initially atrest and free to moveis in the second excited state.It comes to ground state by emitting a photon, then the momentum of hydrogen atom will be approximately: (in `kg-m//s`)

A

`12.1xx0^(-27)`

B

`6.45xx10^(-27)`

C

`3xx10^(-27)`

D

`1.5xx0^(-27)`

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