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An electron in H -atoms jumps from some higher level to 3rd energy level.If three spectral lines are possible for the transition, find the initial position of electron.

Answer» Number of spectral lines `=((n_(2)- n_(1))(n_(2)-n_(1)+1))/(2)`
` implies 3 = ((n_(2)-3)(n_(2)-3+1))/(2)`
`implies 6 = n_(2)^(2) - 5n_(2) + 6` ,brgt `implies n_(2)(n_(2)-5)=0`
or `n_(2)= 0,n_(2)= 5`
Since`n_(2)= 0`is not possible , hence `n_(2) = 5`


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