Q. Thermionic emission from a heated filament varies with its temperature $T$ as
A) $T^{- 1}$
B) $T\ T$
C) $T^{2}$
D) $T^{3/2}$
Explanation
(c) According to Richardson-Dushman equation, number of thermions emitted per sec per unit area $J = AT^{2}e^{- W_{0}/kT} \Rightarrow J \propto T^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.