Ultraviolet light of 200 nm wavelength is incident on polished surface of iron .Its work function is 4.71 eV what will be value of stopping potential?`[h=6.626xx10^(-34)]JSc=3xx10^(8)m//s1eV=1.6xx10^(-19)J ]`

Options

A. 0.5V
B. 1.5 V
C. 2.5 V
D. None of these

Answer

B

Explanation

`eV_(0)=hf-phi`
`V_(0)=(hc)/(lambdae)-(phi)/(e )`
`=(6.626xx10^(-34)xx3xx10^(8))/(2xx10^(-7)xx1.6xx10^(-198))-(4.71e)/(e )`