Question

In a hydrogen atom, if energy of an electron in the ground state is 13.6 eV, then that in the 2nd excited state is:

• A. $1.51\text{eV}$
• B. $3.4\text{eV}$
• C. $6.04\text{eV}$
• D. $13.6\text{eV}$

Answer 1

The correct option is A $1.51\text{eV}$

2nd excited state will be the 3rd energy level.
$E_n=\frac{13.6}{n^2}\text{eV}$ or $E=\frac{13.6}{9}\text{eV}=1.5\text{eV}$