# (a) Define the terms, (i) threshold frequency and (ii) stopping potential in photoelectric effect. (b) Plot a graph of photocurrent versus anode potential for a radiation of frequency $\nu$and intensities $I_{1}$  and $I_{2}(I_{1}.

(a) (i) Threshold frequency = The minimum frequency that's required for emission of electrons from a metal surface when electromagnetic radiation falls on the metal surface

(ii) Stopping potential in the photoelectric effect.

It is the necessary potential applied externally to prevent the most energetic electron from reaching the endplate.

(b) Graph plotting of photocurrent versus anode potential:

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