What type of material makes up the functional aspect of the transducer that creates the high-frequency sound?

Question

Quizplus · Accepted Answer

Crystals, specifically piezoelectric crystals, are commonly used in the functional aspect of transducers to convert electrical energy into high-frequency sound waves. This is because they have the ability to generate an electrical charge when subjected to mechanical stress, such as pressure waves.

What Type of Material Makes Up the Functional Aspect of the Transducer