The Balm er series in the hydrogen sp ec...

The Balm er series in the hydrogen sp ectru m corresponds to the transition from `n_(1)` = 2 to `n_(2)` = 3, 4,........This series lies in th e visible region. Calculate the wave num ber of line associated with the tran sitio n in Balm er series w hen the electron m oves to n = 4 orbit. `(R_(H) = 109677 cm^(-1) )`

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`barv=109677 [(1)/(n_(i)^(2))-(1)/(n_(f)^(2))]cm^(-1)`
so `n_(i) =2 to n_(f) =4` transition in balmer series
`=109677 (1/4-1/16)cm^(-1) =20564.44 cm^(-1)`

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