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The first emission line of Balmer series...

The first emission line of Balmer series in `He^(+)` - spectrum has the wave no .in `(Cm^(_1))` (R-Rydberg constant)

A

`(3R)/(4)`

B

`(20R)/(36)`

C

`(5R)/(36)`

D

`(R)/(6)`

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