#### Question

Let i_{0} be the thermionic current from a metal surface when the absolute temperature of the surface is T_{0}. 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/i_{0}) against (T/T_{0})?

a

b

c

d

#### Solution

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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#### APPEARS IN

Solution Let I0 Be the Thermionic Current from a Metal Surface When the Absolute Temperature of the Surface is T0. Concept: Electron Emission.