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What is piezo - electric effect ?...

What is piezo - electric effect ?

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1. Ultrasound waves are produced by a physical phenomenon known is Piezo - electric effect.
2 . When an electric potential is applied to certain crystals for example : Lead zirconate, they become excited, vibrate and produce ultrasound.
3. When the ultrasound waves are introduced through homogenous tissue, they pass unimpeded until they meet another tissue or organ.
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