Question

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

• A. $2.18\times 10^{-14}\,J$
• B. $2.18\times 10^{-16}\,J$
• C. $2.18\times 10^{-18}\,J$
• D. $2.18\times 10^{-19}\,J$

Answer 1

Answer: (C)

Here the ground state energy, $(E) = -13.6 \,eV$
Since, K.E. of the electron $= - E = 13.6 \,eV$
$= 13.6 \times 1.6 \times 10^{-19}\, J$
$ = 21.76 \times 10^{-19}\, J$
$ = 2.18 \times 10^{-18}\, J$