When the electrons of hydrogen atom retu...

When the electrons of hydrogen atom return to L shell from shells of higher energy, we get a series of lines in the spectrum. This series is called

Balmer series

Lyman series

Brackett series

Paschen series

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The observed wavelength in the line spectrum of hydrogen atom were first expressed in term of a series of johann jakob Balmer a series teacher Balmer's empirical formula is 1/lambda=R_H(I/2^2-I/N^2)"________"n ge 3 ,R_H=109678cm^-1 is Rydberg constant.Niele Bohr derived this expression theoretically in 1913 the formula is generalised to any uni electronic species. How many lines in the spectrum will be observed when an electron returns from 7th shell to 2nd shell?

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