Question

Based on given graph between stopping potential and frequency of irradiation, work function of metal is equal to

• A. 1 eV
• B. 3 eV
• C. 2 eV
• D. 4 eV

Answer 1

Answer: (C)

2 eV

Answer 2

The correct answer is option (C) : 2 eV

$eV_5=h_v-\phi$

On extrapolating the graph , the graph cuts the yaxis at -2

$\Rightarrow$ at v=0,vs=-2v

$\Rightarrow \phi = 2\,eV$