Electronic Devices and Circuits - ECE Questions and Answers

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Assertion (A): Oxide coated cathodes are very commonly used.

Reason (R): Work function of oxide coated cathode is 1 eV whereas it is 4.5 eV for pure tungsten.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

Answer : Option A

Explanation :

Lower work function leads to higher emission current. Therefore oxide coated cathodes are commonly used.

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