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Radiation of certain frequency is emitte...

Radiation of certain frequency is emitted when electronic transition occurs from n = 4 to n = 2 in `He^(+)` which transition in H atom gives radiation of the same frequency?

A

n = 4 to n = 2

B

n = 3 to n = 2

C

n = 3 to n = 1

D

n = 2 to n = 1

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