In biologic media, impedance values are commonly expressed in which units?

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Multiple Choice

In biologic media, impedance values are commonly expressed in which units?

Explanation:
Impedance in biologic media refers to acoustic impedance—the ratio of acoustic pressure to particle velocity as sound travels through tissue. Its unit is the Rayl (Pa·s/m), and because tissue impedances are fairly large, values are often given in megaRayls. The other options mix units that don’t describe how sound interacts with a medium: Pascals and Bars are pressure units, Ohms and Siemens are electrical impedance units, and Newtons and Meters are force and distance.

Impedance in biologic media refers to acoustic impedance—the ratio of acoustic pressure to particle velocity as sound travels through tissue. Its unit is the Rayl (Pa·s/m), and because tissue impedances are fairly large, values are often given in megaRayls. The other options mix units that don’t describe how sound interacts with a medium: Pascals and Bars are pressure units, Ohms and Siemens are electrical impedance units, and Newtons and Meters are force and distance.

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