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

Answer

C

Explanation

`K.E._(max)=0.5eV`
`1/2m_ev_(max)^2=eV_0=0.5eV`
`V_0=0.5 V`