A) \[1.09\times {{10}^{7}}per\ m\]
B) \[1.09\times {{10}^{8}}per\ m\]
C) \[1.09\times {{10}^{9}}per\ m\]
D) \[1.09\times {{10}^{5}}per\ m\]
Correct Answer: A
Solution :
\[\frac{1}{\lambda }=R\left[ \frac{1}{4}-\frac{1}{9} \right]=\frac{5R}{36}\] \[\therefore R=\frac{36}{5\lambda }=\frac{36}{5\times 6563\times {{10}^{-10}}}=1.09\times {{10}^{7}}{{m}^{-1}}\]
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