Thermionic emission from a heated filament va | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) According to the Richardson-Dushman equation,the thermionic emission current density $J$ is given by:$J = AT^2 e^{-W_0/kT}$where $A$ is the Richar

Vedclass · Accepted Answer

$T^2$

Vedclass · Answer

(C) According to the Richardson-Dushman equation,the thermionic emission current density $J$ is given by:$J = AT^2 e^{-W_0/kT}$where $A$ is the Richardson constant,$T$ is the absolute temperature,$W_0$ is the work function of the metal,and $k$ is the Boltzmann constant.From this equation,it is evident that the emission current density $J$ is proportional to the square of the absolute temperature,i.e.,$J \propto T^2$.Therefore,the correct option is $C$.

Thermionic emission from a heated filament varies with its temperature $T$ as

Similar Questions

The metal which has the highest work function among the following is:

Thermions are

Positive rays were discovered by

Cathode rays are similar to visible light rays in that

The filament of an electron gun is made of which material and coated with which material? Why?

Vedclass Test Series

Exam Paper Generator

Online Exam Module