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The ratio of the wavelength for the tran...

The ratio of the wavelength for the transition from n = 2 to n = 1 in `Li^(++).He^(+)` and H is

A

`1:2:3`

B

`1:4:9`

C

`3:2:1`

D

`4:9:36`

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The correct Answer is:
D
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