1.

In a single isolated atomof hydrogen electron make transition from4^(th)excited state to grond state producingmaximumpossible number of wavelengthsif the 2^(nd)lowest energy of theselinesis used to further excite an already excitedsample of Li^(2+)ion then transition will be

Answer»

`12rarr 15`
`9 RARR 12`
`6 rarr 9`
`3 rarr 6`

ANSWER :B


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