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Question
How many lines in the spectrum will be observed when electrons return from 7th shell to 2nd shell?
How many lines in the spectrum will be observed when electrons return from 7th shell to 2nd shell?
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Solution
The correct option is C 15
No of spectral lines=(n2−n1)(n2−n1+1)2(here,n2=7,n1=2(given))=(7−2)(7−2+1)2=(5)(6)2=15 spectral lines
No of spectral lines=(n2−n1)(n2−n1+1)2
(here,n2=7,n1=2(given))
=(7−2)(7−2+1)2
=(5)(6)2
=15 spectral lines
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