Question

If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then

• A. Stopping potential will decrease
• B. Stopping potential will increase
• C. Kinetic energy of emitted electrons will decrease
• D. The value of work function will decrease

Answer 1

The correct option is B

Stopping potential will increase

Stopping potential $V_0=\frac{hc}{e}[\frac{1}{\lambda }-\frac{1}{{\lambda }_0}].$ As $\lambda$ decreases so $V_0$ increases.