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Find the ratio of frequency of e^(-) in ...

Find the ratio of frequency of `e^(-)` in `1^(st)` orbit of H atom to `3^(rd)` of `He^(+)` ion.

A

`(27)/(4)`

B

`(4)/(27)`

C

`(54)/(4)`

D

`(27)/(8)`

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The correct Answer is:
A
Same charge near to each other.
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