Question

In $n$th orbit of hydrogen atom energy $E=\frac{-13.6}{n^2}eV$, then energy required to displace electrons from $n=1$ to $n=2$ is:

• A. -10.2 eV
• B. 3.4 eV
• C. -13.6 eV
• D. 1.51 eV

Answer 1

Answer: (A)

Energy required to displace electron from
$n=1$ to $n=2$
$E=-13.6\left\{\frac{1}{1^2}-\frac{1}{2^2}\right\}$
$=-13.6\times \frac{3}{4}=-10.2eV$