Let i0 be the thermionic current from a metal surface when the absolute temperature of the surface is T0. The temperature is slowly increased and the thermionic current is measured as a function of temperature. Which of the following plots may represent the variation in (i/i0) against (T/T0)?
We know that current in thermionic emission varies to square of Temperature. of cathode with exponential term
The best suited curve from the figures which satisfy the equation is the parabolic one.
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