Which one is the correct relation for thermio | vedclass

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

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

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(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?

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