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Find out the wavelength of the next line...

Find out the wavelength of the next line in the series having lines of spectrum of H-atom of wavelength 6565Ã…, 4863Ã…, 4342Ã… and 4103Ã….

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The correct Answer is:
3972Ã…
All these lines are in visible region and thus, belong to balmer series. Next line is therefore, from 7th orbit.
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