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Investigating the photoelectric effect

The image below shows the set-up used to investigate the photoelectric effect:

Some of the parts of this circuit are:

This is a voltmeter

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This is a galvanometer - used for measuring small electric currents.

There is then the large round edge box shape, with three rays of light being delivered to it.
This is a vacuum. The light is called the incident light. There are then two ends of the wires
leading to…


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