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The wavelength of the first spectral lin...

The wavelength of the first spectral line in the Balmer series of hydrogen atom is `6561 A^(@)` . The wavelength of the second spectral line in the Balmer series of singly - ionized helium atom is

A

`1215Å`

B

`1640Å`

C

`2320Å`

D

`4687Å`

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The correct Answer is:
A
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