Question

The total energy of electron in the ground state of hydrogen atom is -13.6 eV. The kinetic energy of an electron in the first excited state is

(a) 6.8 eV

(b) 13.6 eV

(c) 1.7 eV

(d) 3.4 eV

Answer 1

The correct option is (d) 3.4 eV.

Explanation:

Energy of nth orbit of hydrogen atom is given by

Kinetic energy of an electron in the first excited state is

K = -E₂ = 3.4 eV