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Discussion

Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.

Reason (R): Thermionic emission current ∝ 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

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