The solar device used in traffic signal light, works on which of the following principle?

Conservation of momentum

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Doppler effect

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Photovoltaic effect

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Electromagnetic induction

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Solution

The correct option is C Photovoltaic effect
The device used in traffic signal lights is Solar traffic light. are signalling devices powered by solar panels positioned at road intersections, pedestrian crossings and other locations to control the flows of traffic.

Most solar traffic lights use LED lamps inside. These lamps work on the principle of Photovoltaic effect to work.
Hence correct answer is option C.

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Which of the following devices works on the principle of electromagnetic induction?

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