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
 

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