Question

The electron in the hydrogen atom jumps from excited state (n = 3) to its ground state (n = 1) and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV the stopping potential is estimated to be (the energy of the electron in nth state E_n = -13.6/n² eV)

(a) 5.1 V

(b) 12.1 V

(c) 17.2 V

(d) 7 V

Answer 1

The correct option is (d) 7 V.

Explanation:

Energy released when electron in the atom jumps from excited state (n = 3) to ground state (n = 1) is