Atomic StructureHard
Question
The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 
The wavelength of the second spectral line in the Balmer series of singly-ionized helium atom is
The wavelength of the second spectral line in the Balmer series of singly-ionized helium atom is Options
A.1215
B.1640
C.2430
D.4687
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