A) \[\frac{5}{31}\frac{1}{\Delta \lambda .{{Z}^{2}}}\]
B) \[\frac{5}{36}\frac{{{Z}^{2}}}{\Delta \lambda .}\]
C) \[\frac{31}{5}\frac{1}{\Delta \lambda .{{Z}^{2}}}\]
D) none of these
Correct Answer: C
Solution :
[c] \[\Delta \lambda ={{\lambda }_{1}}-{{\lambda }_{2}}\] \[\frac{1}{R\left[ \frac{1}{{{\left( 2 \right)}^{2}}}-\frac{1}{{{\left( 3 \right)}^{2}}} \right]{{Z}^{2}}}=-\frac{1}{R\left[ 1-0 \right]{{Z}^{2}}}\]. On solving, \[R=\frac{31}{5}\frac{1}{\Delta \lambda .{{Z}^{2}}}\]
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