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They are used in
I. Photometer
ii. Burglar alarms
iii. Automatic door
iv. Television cameras
v. Counting operations
vi. Sound production from film track
When light of appropriate frequency falls on the cathodeA cathode is the electrode from which a conventional current leaves the electrolyte. It is the negative part of the cell where reduction takes place. More photosensitive surface, electrons are emitted. Since the anodeAn anode is an electrode of a polarized electrical device through which conventional current enters the device. It is the positive part of electrolytes where oxidation takes place. More is positive with respect to cathode, electrons are attracted to the anode, and the flow of electrons completes the circuit and current flows.
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