In a single isolated atom of hydrogen e...

In a single isolated atom of hydrogen electron make transition from `4^(th)` excited state to grond state producing maximum possible number of wavelengths if the `2^(nd)` lowest energy of these lines is used to further excite an already excited sample of `Li^(2+)` ion then transition will be

A

`12to15`

B

`9to12`

C

`6to9`

D

`3to6`

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