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

Assertion: In a photoemissive cell,an inert gas is used.
Reason: An inert gas in the photoemissive cell provides a greater current.

Cathode rays are similar to visible light rays in that

The order of the $q/m$ ratio for a proton,$\alpha$-particle,and electron is:

The thermionic emission of electrons is due to:

Write observations of various experiments which suggest that cathode rays are a stream of negatively charged particles.

Vedclass Test Series

Exam Paper Generator

Online Exam Module