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Give some important uses of photo-cells....

Give some important uses of photo-cells.

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Photo cells have many applications, especially as switches and sensors.
Automatic lights that turn on when it gets dark use photocells, as well as street lights that switch on and off according to whether it is night or day.
Photo cells are used for reproduction of sound in motion pictures and are used as timers to measure the speeds of athletes during a race.
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