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If an electron in an atom deexiting from 5 to 1 and 4 to 2 then number of spectral lines is
Possible spectral lines= (n2-n1)(n2-n1+1)/2so for 5 to 1 spectral lines are 10and for 4 to 2 spectral lines are 3.Hope it clears.
We can get the answer by using the formula (n2-n1)(n2-n1+1)/2 Where n2 is the no. From where electron come and n1 is the no. Where electron go .I hope its clear to u..
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