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Difference in wavelength of two extreme ...

Difference in wavelength of two extreme lines of Lyman series in emission spectrum of `He^(+)` would be :

A

`(1)/(12R_(H))`

B

`(12)/(R_(H))`

C

`(1)/(4R_(H))`

D

`(1)/(3R_(H))`

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The correct Answer is:
A
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