Ultrasonic waves are produced by making use of

by

Ultrasonic waves are produced by making use of

ferromagnetic material
ferrimagnetic material
piezoelectric material
pyroelectric material
This question was previously asked in
UPSC CDS-2 – 2017
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Ultrasonic waves are commonly produced by utilizing the piezoelectric effect, typically in materials like quartz crystals or certain ceramics.
Piezoelectric materials convert electrical energy into mechanical vibrations and vice versa. By applying a high-frequency alternating voltage across a piezoelectric crystal, it vibrates at that frequency, generating ultrasonic waves.
The piezoelectric effect is reversible. Piezoelectric materials are used in ultrasonic transducers for various applications, including medical imaging (ultrasound scans), sonar, industrial testing (non-destructive testing), and cleaning (ultrasonic cleaners).

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