In a triode valve,which of the following stat | vedclass

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(C) The thermionic emission current $I$ is given by Richardson-Dushman equation: $I = AT^2 e^{-\phi/kT}$,where $A$ is a constant,$T$ is the absolute t

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If the temperature of the filament is doubled,then the thermionic current will nearly be four times.

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(C) The thermionic emission current $I$ is given by Richardson-Dushman equation: $I = AT^2 e^{-\phi/kT}$,where $A$ is a constant,$T$ is the absolute temperature,$\phi$ is the work function,and $k$ is the Boltzmann constant.Since $I \propto T^2$,if the temperature $T$ is doubled $(T' = 2T)$,the new current $I'$ becomes $I' \propto (2T)^2 = 4T^2$.Therefore,the thermionic current becomes nearly four times the original value.Thus,option $C$ is correct.

In a triode valve,which of the following statements is correct?

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