A) 9/7
B) 7/5
C) 27/5
D) 20/7
Correct Answer: D
Solution :
\[\frac{1}{\lambda }=R\left( \frac{1}{n_{f}^{2}}-\frac{1}{n_{i}^{2}} \right)\] \[\frac{1}{{{\lambda }_{1}}}=R\left( \frac{1}{{{3}^{2}}}-\frac{1}{{{4}^{2}}} \right)\] \[\frac{1}{{{\lambda }_{1}}}=R\left( \frac{7}{9\times 16} \right)\] \[\frac{1}{{{\lambda }_{2}}}=R\left( \frac{1}{{{2}^{2}}}-\frac{1}{{{3}^{2}}} \right)\] \[=R\left( \frac{5}{4\times 9} \right)\] \[\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}=\frac{\frac{5}{36}}{\frac{7}{9\times 16}}\]\[=\frac{20}{7}\]You need to login to perform this action.
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