Question

The ground state energy of hydrogen atom is $-13.6 \,eV$. The kinetic energy of the electron in this state is, find the potential energy of electron (in Joule) in the given state.

• A. $-4.36 \times 10^{-14}\,J$
• B. $-4.36 \times 10^{-16}\,J$
• C. $-4.36 \times 10^{-17}\,J$
• D. $-4.36 \times 10^{-18}\,J$

Answer 1

Answer: (D)

As, $P.E. = -2\, K.E$.
Here, $K.E. = 13.6 \,eV = 2.18 \times 10^{-18}\, J$
Hence, $P.E. = -2 \times 2.18 \times 10^{-18}\,J $
$= -4.36 \times 10^{-18}\, J$