ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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Impedance is NOT influenced by which component?

The frequency of the transducer
Density
Propagation speed
Stiffness

The correct answer is: The frequency of the transducer

Impedance, a measure of the resistance to sound transmission through a medium, is not influenced by the frequency of the transducer. Impedance is determined by the density and propagation speed of the medium the sound wave is traveling through, as well as the stiffness of the medium. These factors play a role in how easily the sound wave can propagate through the medium, affecting the overall impedance. However, the frequency of the transducer, or the number of wave cycles per second produced by the transducer, does not directly impact the impedance of the medium.