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

Options

A. 1.8 V
B. 1.3 V
C. 0.5 V
D. 2.3 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`