Question

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. 1.8V
• B. 1.3V
• C. 0.5 V
• D. 2.3 V

Answer 1

Answer: (C)

0.5 V

Answer 2

$K .E _{\cdot \max }= eV _{0}$
$V _{0}=\frac{ K \cdot E _{\max }}{ e }=\frac{0.5 \,eV }{ e }$
$V _{0}=0.5$ volt