Question

The first excitation energy of hydrogen atom is x eV. Then, the ionisation energy of the atom would be (in eV)

(a) 3x/4

(b) 4x/3

(c) x/4

(d) x/3

Answer 1

The correct option is (b) 4x/3.

Explanation:

Let first excitation energy of hydrogen atom be x. Energy level of first excitation state (n2) = 2 and energy level of ground state (n1)= 1

First excitation energy of hydrogen atom,