A) 10
B) 5
C) 12
D) 15
Correct Answer: A
Solution :
Number of spectral lines obtained when an electron drops from nth level to ground level \[=\frac{n(n-1)}{2}\] \[\therefore \]Number of emission lines obtained, when electron drops from 5th level to ground state \[=\frac{5(5-1)}{2}\] \[=\frac{5\times 4}{2}=10\]You need to login to perform this action.
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