Q. If the first excitation potential of a hydrogen-like atom is V electron volt, then the ionization energy of this atom will be
(a) V electron volt
(b) 3V/4 electron volt
(c) 4V/3 electron volt
(d)cannot be calculated by given information
Ans: (c)
Sol: E −E/4 = V
3E/4 = V
E = 4V/3