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write the formula for the wave number of a spectral line of Balmer series.

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Balmer series consists of spectral lines emitted during transitions of electron from higher energy orbits to the second orbit i.e., `n_(1) =2 and n_(2)` 3,4,5 , ……….`oo`
`bar(v) =((1)/(4)-(1)/(n_(2)^(2)))=R((n_(2)^(2)-4)/(4n_(2)^(2)))`
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