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The electron in a H- atom makes a transi...

The electron in a `H-` atom makes a transition from `n_(1) to n_(2)` where `n_(1)` and `n_(2)` are the principal quantum number of the states. Assume Bohr's model to be valid. The time period of the electron in initial state is `27` times that in final state Find the possible value of `n_(1)` and `n_(2)` if only just first `10` states are in the visible range of instrument.

A

`1-2`, `2-4`,`3-6`,`4-8`,`5-10`

B

`1-3`,`2-6`,`3-9`

C

`14`,`28`

D

none

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