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How many Balmer spectral lines will be o...

How many Balmer spectral lines will be obtained when the excited electrons return from 8th shell to 2nd shell?

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The observed wavelegnth in the line spectrum of hydrogen atom were first expressed in terms of a series by Johann Jakob Balmer, a Swiss teacher. Balmer's emipirical formula is (1)/(lamda)=R_(H)[(1)/(2^(2))-(1)/(n^(2))]n=3,4,5 . . . R_(H)=109678cm^(-1) is the Rydberg constant. Niels Bohr derived this expression theoretically in 1913. The formula is generalised to any one electron atom/ion.Howmany lines in the spectrum will be observed when electrons return from 7th shell to 2nd shell?

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