Question

Energy of the state $S_1$ in units of the hydrogen atom ground state energy is:

• A. 0.75
• B. 1.5
• C. 2.25
• D. 4.5

Answer 1

The correct option is C 2.25

$E_{s_1}=\frac{-13.6\times Z^2}{n^2}$ where $Z=3,n=2$
$E_H=\frac{-13.6\times Z^2}{n^2}$ where $Z=1,n=1$
$\frac{E_{s_1}}{E_{H\left(ground\right)}}=\frac{-13.6\times 9}{4\times (-13.6)}=2.25$