Question

The ground state energy of hydrogen atom is $-13.6eV$. The kinetic energy of the electron in this state is :

• A. $27.2eV$
• B. $13.6eV$
• C. $6.8eV$
• D. $3.4eV$

Answer 1

The correct option is B $13.6eV$

The kinetic energy of hydrogen is given as,

$K{E}_n=-\frac{E}{n^2}$

where, E is ground state energy and n is the respective orbit.

Here, n=1,

$KE=-\frac{(-13.6)}{1^2}$

$KE=13.6eV$

Hence, correct answer is option B.