Q. If in a photoelectric experiment, the wavelength of incident radiation is reduced from $6000\ \mathring{\mathrm{A}}$ to $4000\ \mathring{\mathrm{A}}$ 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
Explanation
(b) Stopping potential $V_{0} = \frac{hc}{e}\left\lbrack \frac{1}{\lambda} - \frac{1}{\lambda_{0}} \right\rbrack.$ As $\lambda$ decreases so $V_{0}$ increases
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.