A) 13.6
B) 3.4
C) 17.0
D) 10.2
Correct Answer: D
Solution :
\[\Delta E=13.6\,{{Z}^{2}}\left( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} \right)\] \[=13.6\times {{(1)}^{2}}\left( \frac{1}{1}-\frac{1}{{{2}^{2}}} \right)\] \[=13.6\left( 1-\frac{1}{4} \right)\] \[=13.6\times \frac{3}{4}=10.2\,eV\]
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