Question

In a photoelectric experiment , the wavelength of incident radiation is decreased from 6000 A to 5000 A it is observed that:

• A. the photoelectric current reduces to zero
• B. the stopping potential decreases
• C. the photoelectric current increases
• D. the stopping potential increases

Answer 1

The correct option is D the stopping potential increases

We know that,

$\varphi =\frac{h_c}{\lambda }-e{V}_0\varphi =$ work function of a particular metal will remain constant.

If $\lambda =$ incident radiation wavelength is increased.

$V_0=$ stopping potential also has to increase to keep $p$ constant.