In photoelectric emission process from a metal of work function 1.8 eV

1.	In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is (a) 1.8 V (b) 1.3 V (c) 0.5 V (d) 2.3 V
Answer» (c) 0.5 V Explanation: The stopping potential V_s is related to the maximum kinetic energy of the emitted electrons K_max through the relation K_max = eV_s 0.5 eV = eV_s or V_s = 0.5 V

In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is (a) 1.8 V (b) 1.3 V (c) 0.5 V (d) 2.3 V

Answer»

(c) 0.5 V Explanation:

The stopping potential V_s is related to the maximum kinetic energy of the emitted electrons K_max through the relation

K_max = eV_s

0.5 eV = eV_s or V_s = 0.5 V