Photo-electric effect continued..
The image shown here is of a photo tube being illuminated with
light from an LED. The needle on the meter is moving because a small current is
being generated by the light hitting a plate in the photo-tube. There is no
other source of electricity. The photons produced by the LED are knocking
electrons from the atoms on the surface of the plate. These are collected by the
electrode in the centre and a circuit is completed via the meter as shown in the
circuit diagram below.
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Circuit Diagram
