Materials and Components

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 I_th = 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

ANS:A - Both A and R are true and R is correct explanation of A

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

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