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This is known as the piezoelectric effect.
The acoustic impedance of a medium is a measure of its opposition to the propagation of sound waves. The acoustic impedance of a medium is the product of the density of the medium and the speed of sound in the medium.
Z = pu
The velocity of sound in most materials is different and the densities of most materials are different. Since the acoustic impedance of a material is defined as the product of its density and the velocity of sound through it, then different materials will generally have different acoustic impedances.
Both density and velocity of sound through a medium are variable so acoustic impedance is not directly proportional to velocity of sound or density...
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