no of line in line spectrum is equal to jumps of electron from one shell to another.(adsbygoogle = window.adsbygoogle || []).push({}); Am i correct.

IN my book it is written that if a electron in hydrogen jumps from n_{1}to n_{2}then number of spectral lines is given by formula {(n_{1}-n_{2})(n_{1}-n_{2}+1}/2. so consider a electron jump from 4^{th}shell to 2^{nd}shell then number of kinds of jump can be (1) 4^{th}to 3^{rd},(2) 4^{th}to 2^{nd}So there are only two jumps. but if we apply formula then it will come out to be 3. So where i or formula is wrong.

thanks for any kind of help.

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# Line spectrum of hydrogen.

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