# Define the Following with Reference to Photoelectric Effect : - Physics (Theory)

Define the following with reference to photoelectric effect :

(a) Threshold frequency (f_0)

(b) Stopping potential (V_s)

#### Solution

(a) The minimum frequency of incident radiation below which photoelectric emission is not possible for a photosensitive plate of a given material, is called threshold frequency (f_0) .

(b) The mimimum magnitude of negative potential of the collector plate relative to the emitter plate, for which the photocurrent becomes zero, is called stopping potential (V_s) .

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