Question

Why capsicum and potassium are useful as electrodes in photoelectric cell?

Answer 1

hey mates here is ur answer

Concpet:- metal have high tendency to lose electrons.(lower the ionisation energy, higher is the tendency to lose electrons) that's why metals are used in photoelectric cells.

Potessium and Caesium have much lower Ionisation enthalpy than that of Lithium . Therefore ,these metals on exposure to light emits electrons easily but lithium doesn't . That's why K and Cs rather than Li are used in photoelectric cells.