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Discussion

Assertion (A): At a temperature of 1000 K, thermionic emission current is about 0.1 A/cm2 of surface.

Reason (R): Thermionic emission current is given by Ith = SA0 T2 e-Ew/kT.

  • A.Both A and R are true and R is correct explanation of A
  • B.Both A and R are true but R is not correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

If different values are substituted in the equation for Ith the value of emission current comes out to be about 0.1 A/cm2.

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