A) 12
B) 15
C) 14
D) 10
Correct Answer: B
Solution :
Number of spectral lines \[=\,\,\,\frac{\left( {{n}_{2}}-{{n}_{1}} \right)\left( {{n}_{2}}-{{n}_{1}} +1 \right)}{2}\] \[=\,\,\,\frac{(7-2)(7-2+1)}{2}\]\[=\,\,\,\frac{5\times 6}{2}=15\]You need to login to perform this action.
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