Quartz crystal in quartz watches work on the principle called?

APhotoelectric effect

BStark effect

CThermionic effect

DPiezo-electric effect

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Correct Answer: D: Piezo-electric effect

Explanation: The correct answer is D: Piezo-electric effect. Quartz crystals in quartz watches work on the principle of the Piezo-electric effect. When mechanical pressure is applied to quartz, it generates an electric voltage, and vice versa, providing extremely precise timekeeping.

Quartz crystal in quartz watches work on the principle called?

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