State two properties which a substance should possess when used as a t

1.	State two properties which a substance should possess when used as a thermionic emitter.
Answer» Two properties are: (i) High melting point. (ii) Low work function.

State two properties which a substance should possess when used as a thermionic emitter.

Answer»

Two properties are:

(i) High melting point.

(ii) Low work function.