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Question

Total number of spectral lines when electron jumps from 8th orbit to 2nd orbit is:

A
6
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B
36
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C
21
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D
38
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Solution

The correct option is A 21
Is electron falls from orbit n2 to n1 then the number of spectral lines emitted is given by,
NE=(n2n1+1)×(n2n1)2
Now, n2=8 to n1=2
NE=21

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