Answer
(d) $2.09\times10^{-18}\,J$
Work Step by Step
$n_{i}=1$ and $n_{f}=5$
$\Delta E=-2.18\times10^{-18}\,J(\frac{1}{n_{f}^{2}}-\frac{1}{n_{i}^{2}})$
$=-2.18\times10^{-18}\,J(\frac{1}{5^{2}}-\frac{1}{1^{2}})$
$=2.09\times10^{-18}\,J$
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