With the aid of a well labelled diagram, describe how stopping potential of a metal can be measured.

With the aid of a well labelled diagram, describe how stopping potential of a metal can be measured.

• An evacuated electric cell X that has inside it a photo-emissive metal cathode, C of large surface area and an anode A for collecting the electron produced
• A is made negative in potential relative to C.
• The photoelectrons emitted from C when illuminated with a suitable beam experience a retarding potential.
• The p.d V is increased negatively until the current become zero and the stopping potential Vs is noted from the voltmeter.

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