Which one is the correct relation for thermio | vedclass

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

Question

(B) The thermionic emission is described by the Richardson-Dushman equation.According to this equation,the current density $J$ emitted from a heated s

Vedclass · Accepted Answer

$J = A{T^2}{e^{ - \varphi /kT}}$

Vedclass · Answer

(B) The thermionic emission is described by the Richardson-Dushman equation.According to this equation,the current density $J$ emitted from a heated surface is given by $J = AT^2 e^{-\varphi/kT}$,where $A$ is the Richardson constant,$T$ is the absolute temperature,$\varphi$ is the work function of the material,and $k$ is the Boltzmann constant.Therefore,the correct relation is $J = AT^2 e^{-\varphi/kT}$.

Which one is the correct relation for thermionic emission?

Similar Questions

Cathode rays are....

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

In $1897$,$J$.$J$. Thomson discovered which particle?

Cathode rays consist of

If the thermionic current density is $J$ and emitter temperature is $T$,then the curve between $\frac{J}{T^2}$ and $\frac{1}{T}$ will be

Vedclass Test Series

Exam Paper Generator

Online Exam Module