MCQ
What is the separation energy (in $eV$ ) for $Be^{3+}$ in the first excited state in ............... $\mathrm{eV}$ ?
- A$13.6$
- B$27.2$
- C$40.8$
- ✓$54.5$
first excited state $n=2$
$E n=-13.6 \frac{z^{2}}{n^{2}}$
$=0-\left(-13.6 \times \frac{4^{2}}{2^{2}}\right)=54.4 e V$
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