| 21. | Magnetostrictive transducers were pursued after WW2 as an alternative to piezoelectric ones.
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| 22. | The acoustic impedance of piezoelectric materials facilitated their use as underwater transducers.
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| 23. | A sound wave is typically produced by a piezoelectric MHz.
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| 24. | Ferroelectric, dielectric ( paraelectric ) and piezoelectric materials have electric polarisation.
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| 25. | All ferroelectric materials are pyroelectric and piezoelectric, but not the converse.
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| 26. | Ferroelectrets display strong piezoelectricity, comparable to ceramic piezoelectric materials.
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| 27. | Other works use a piezoelectric system to generate and control the vibrations.
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| 28. | Acoustic guitars, upright basses and fiddles often use a piezoelectric pickup.
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| 29. | A less frequently used combination is a piezoelectric and a magnetic pickup.
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| 30. | The related piezoelectric effect occurs only in a particular class of dielectrics.
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