Quartz crystal in quartz watches work on the principle called?
- A. Photoelectric effect
- B. Stark effect
- C. Thermionic effect
- D. Piezo-electric effect
- E. None of these
Explanation
Quartz changes its shape slightly when an electric field is applied and produces an electric signal when mechanically stressed. This piezoelectric vibration provides the very stable frequency used to regulate quartz watches.
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