Qstnid -Ii-3-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)? - 41: Electric Current Through Gases

with Solutions - page 2

#3
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)?
Ans : (d)
Since the thermionic current is directly proportional to the square of the temperature of the surface emitting thermions, the graph is parabolic.
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