Explain the concept of piezo-electricity and give its two applications.
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Concept of piezoelectricity:- The phenomenon in which production of polarization, takes place when mechanical stress is applied. Piezoelectricity is a special property of certain material which provides us with a means of converting mechanical energy into electrical energy and vice versa. Rochelle salt, Quartz and Barium titanate are few piezo materials.

Applications:- 1. Piezoelectric transducers are common in ultrasonic applications, such as intrusion detectors and alarms. 2.Piezoelectric devices are employed at AF (audio frequencies) as pickups, microphones, earphones, beepers, and buzzers. 3.In wireless applications, piezoelectricity makes it possible to use crystals and ceramics as oscillators that generate predictable and stable signals at RF (radio frequencies)

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