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ICSE Class 10 Physics Question 8 of 20

Solved 2016 Question Paper ICSE Class 10 Physics — Question 16

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Question

Question 4(a)

State the characteristics required of a good thermion emitter. [2]

Answer

The characteristics required of a good thermion emitter are :

  1. The work function of the substance should be low so that the electrons may be emitted from it even when it is not related to a high temperature.
  2. The melting point of the substance should be high so that it may not melt when it is heated to the temperature required for thermionic emitter.