Question

The total energy of an electron in the first excited state of H-atom is $-3.4eV$, then its potential energy is in this state is ________eV

• A. $6.8$
• B. $3.4$
• C. $-6.8$
• D. $-3.4$

Answer 1

The correct option is C $-6.8$

Given:

Total energy of electron $E=-3.4eV$

The Potential energy of the electron is given by:

$U=2E$

$U=2\times (-3.4eV)$

$\Rightarrow$ $U=-6.8eV$

Thus, option $C$ is correct.