The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 Å. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is :
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A
We know that Balmer series terminates at 
. Hence the first spectral line of Balmer series corresponds to transition from 
to 
. Hence we have
The second line of Balmer series of ionzied helium atom corresponds to transition from 
to 
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