Photo Emissive Cell:
The photo emissive cell consists of a glass envelope with a vacuum inside.
The envelope also contains a light sensitive cathode and an anode.
When light strikes on a photo emissive cell, the radiation causes the cathode negative electrons to be emitted which are attracted by the positive anode and a current to flow (photoelectric effect).
The value of this current is proportional to the intensity of light falling on the cathode.
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