A) 27 : 25
B) 20 : 27
C) 20 : 25
D) 25 : 27
Correct Answer: B
Solution :
[b] By using \[\frac{1}{\lambda }=R\,\left[ \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} \right]\] |
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