Question

If in the first orbit of a hydrogen atom the total energy of the electron is $-21.76 \times 10^{-19} J$, then its electric potential energy will be:

• A. $-43.52 \times 10^{-19} J$
• B. $-21.76 \times 10^{-19} J$
• C. $-10.88 \times 10^{-19} J$
• D. $-13.6 \times 10^{-19} J$

Answer 1

Answer: (A)

Potential energy $=2$ Total energy
$\Rightarrow =2 \times-21.76 \times 10^{-19}$
$\Rightarrow =-43.52 \times 10^{-19} J .$