A) R
B) 3R
C) \[\frac{5R}{36}\]
D) \[\frac{8R}{9}\]
Correct Answer: C
Solution :
Wave number \[\bar{v}=\frac{1}{\lambda }=R\left( \frac{1}{{{n}_{1}}^{2}}-\frac{1}{{{n}_{2}}^{2}} \right)\] Here, \[{{n}_{1}}=2,\,{{n}_{2}}=3\] \[\therefore \] \[\bar{v}\frac{5R}{36}\]
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