Q. A beam of light of wavelength $\lambda$ and with illumination $L$ falls on a clean surface of sodium. If $N$ photoelectrons are emitted each with kinetic energy $E,$ then
A) $N \propto L\ $and$\ E \propto L$
B) $N \propto L$ and $E \propto \frac{1}{\lambda}$
C) $N \propto \lambda$ and$\ E \propto L$
D) $N \propto \frac{1}{\lambda}\ $and $E \propto \frac{1}{L}$
Explanation
(b) Number of photons emitted is proportional to the intensity. Also $\frac{hc}{\lambda} = W_{0} + E$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.