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Taking the wavelength of first Balmer li...

Taking the wavelength of first Balmer line in the hydrogen spectrum `(n=3" to "n=2)` as 660 nm, then the wavelength of `2^("nd")` Balmer line in the same spectrum `(n=4" to "n=2)` will be

A

488.9 nm

B

388.9 nm

C

889.2 nm

D

642.7 nm

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The correct Answer is:
A
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