1.

The observed wavelengths in the line spectrum of hydrogen atom were first expressed in terms of a seriesby Johamn Balmer a swiss teacher. Balmer.s empirical formula is : (1)/(lambda) = R_(H)[(1)/(2^(2))-(1)/(n^(2))]n=3,4,5…. R_(H) = 109678 cm^(-1) is the Rydberg constant How many lines in the spectrum will be observed when electrons return from 7^(th) shell to 2^(nd) shell ?

Answer»

13
14
15
16

Answer :C


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