Question

Find difference in work function of two different metal if their stopping potential are 0.4V and 1.6V respectively.(metals are illuminated with photons of same energy)

Hint:

When the incident light energy is constant, a higher stopping potential means the electrons had more kinetic energy, which implies they had to overcome a smaller work function. The difference in stopping potentials in Volts is numerically equal to the difference in work functions in electron-Volts (eV).

Answer 1