Q.

For photoelectric effect to take place, the metal used as the cathode should have –

A. high melting point
B. low melting point
C. low work function
D. low resistance
Answer» C. low work function
Explanation: The photoelectric effect is the propensity of high-energy electromagnetic radiation to eject electrons from a given material. The photoelectric effect has been utilized in devices called photocells, consisting of two electrodes in a sealed vacuum tube.
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