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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

1215 Å

B

1640 Å

C

2430 Å

D

4687 Å

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