Acoustic impedance equals density times the propagation speed. Which option correctly states this?

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Multiple Choice

Acoustic impedance equals density times the propagation speed. Which option correctly states this?

Explanation:
Acoustic impedance is determined by how much a medium resists the passage of sound, and for plane waves it’s the product of density and the speed of sound: Z = ρ c. This means impedance grows when the medium is denser or when sound travels faster. So the statement that impedance equals density times the propagation speed is the correct one. Impedance is not independent of speed, it’s not inversely proportional to density, and it does depend on density—the impedance changes with both.

Acoustic impedance is determined by how much a medium resists the passage of sound, and for plane waves it’s the product of density and the speed of sound: Z = ρ c. This means impedance grows when the medium is denser or when sound travels faster. So the statement that impedance equals density times the propagation speed is the correct one. Impedance is not independent of speed, it’s not inversely proportional to density, and it does depend on density—the impedance changes with both.

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