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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
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
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