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

The mass of the electron varies with

In the phenomenon of electric discharge through gases at low pressure,the coloured glow in the tube appears as a result of
[$AIPMT$ $2008$]

Cathode rays travelling from east to west enter into a region of an electric field directed towards north to south in the plane of the paper. The deflection of cathode rays is towards:

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

Write the name of the universal and fundamental particle of matter.

Vedclass Test Series

Exam Paper Generator

Online Exam Module