The electron in a hydrogen atom makes a transition `n_(1) rarr n_(2)` where `n_(1)` and `n_(2)` are the principal qunatum numbers of the two states. A

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The electron in a hydrogen atom makes a transition `n_(1) rarr n_(2)` where `n_(1)` and `n_(2)` are the principal qunatum numbers of the two states. Assume the Bohr model to be valid. The frequency of orbital motion of the electron in the initial state is `1//27` of that in the final state. The possible values of `n_(1)` and `n_(2)` are
A. `n_(1) = 4, n_(2) = 2`
B. `n_(1) = 3, n_(2) = 1`
C. `n_(1) = 8, n_(2) = 1`
D. `n_(1) = 6, n_(2) = 3`


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Correct Answer - B
`T prop n^(3)`
`T_(i)/T_(f)=1/27=(n/m)^(3) implies n/m=1/3`

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