Department of Pre-University Education, Karnataka course PUC Karnataka Science Class 12
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Let I0 Be the Thermionic Current from a Metal Surface When the Absolute Temperature of the Surface is T0. - Physics

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Question

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)?

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