$\text{Dane:}$  

${\text{E}}_0=13,6\text{eV}$   

${\text{n}}_3=3$  

${\text{n}}_5=5$  

$\text{Szukane:}$  

${\text{E}}_3,{\text{E}}_5=\text{?}$  

Korzystamy ze wzoru:

${\text{E}}_{\text{n}}=-\frac{{\text{E}}_0}{{\text{n}}^2}$  

Wstawiamy dane i obliczamy:

${\text{E}}_3=-\frac{{\text{E}}_0}{{\text{n}}_3^2}=-\frac{13,6\text{eV}}{3^2}$  

${\text{E}}_3\approx -1,51\text{eV}$   

${\text{E}}_5=-\frac{{\text{E}}_5}{{\text{n}}_5^2}=-\frac{13,6\text{eV}}{5^2}$  

${\text{E}}_5=-0,544\text{eV}$