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The ratio of difference in wavelengths o...

The ratio of difference in wavelengths of `1^(st)` and `2^(nd)` lines of Lyman series in H-like atom to difference in wavelength for `2^(nd)` and `3^(rd)` lines of same series is :-

A

`2.5:1`

B

`3.5:1`

C

`4.5:1`

D

`5.5:1`

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The correct Answer is:
B
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