Q. Ultrasonic waves are produced by

A
Peltier's Effect
B
Piezoelectric Effect
C
Doppler's Effect
D
Coulomb's Effect
Solution:

Piezoelectricity is the electric charge that accumulates in certain solid materials in response to applied mechanical stress. The word piezoelectricity means electricity resulting from pressure and latent heat. The piezoelectric effect can be used to detect as well as generate ultrasonic waves.

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