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For thermionic emission
  • a)
    a material with low work function is preferable.
  • b)
    a material with high work function is preferable.
  • c)
    the work function of the material has no importance.
  • d)
    none of the above
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
For thermionic emissiona)a material with low work function is preferab...
The work function of a metal represents the minimum amount of energy that must be given to the fastest-moving electron at the absolute zero of temperature in order for this electron to be able to escape from the metal. Hence, low work function (Ew) is required for thermionic emission.
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For thermionic emissiona)a material with low work function is preferable.b)a material with high work function is preferable.c)the work function of the material has no importance.d)none of the aboveCorrect answer is option 'A'. Can you explain this answer?
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