A) 1\[\overset{o}{\mathop{\text{A}}}\,\]
B) 1.3872\[\overset{o}{\mathop{\text{A}}}\,\]
C) 0.3541\[\overset{o}{\mathop{\text{A}}}\,\]
D) 0.5\[\overset{o}{\mathop{\text{A}}}\,\]
Correct Answer: B
Solution :
\[E\propto \frac{{{z}^{2}}}{{{n}^{2}}}\]and\[E\propto \frac{1}{\lambda }\] \[\therefore \] \[\frac{{{Z}^{2}}}{{{n}^{2}}}=\frac{1}{\lambda }\] \[\frac{Z_{1}^{2}}{Z_{2}^{2}}=\frac{{{\lambda }_{2}}}{{{\lambda }_{1}}}\] \[\frac{{{(42)}^{2}}}{{{(30)}^{2}}}=\frac{{{\lambda }^{2}}}{0.7080}\] \[{{\lambda }_{2}}=1.3872{AA}\]
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