Impedance is measured with units of _____ and is often represented by the letter _____.

Impedance is measured with units of _____ and is often represented by the letter _____.

• A. Rayls; Z
• B. Mrayls; Z
• C. Rayls; R
• D. Rayls; I

Answer: (B)

Impedance in acoustics describes how much pressure is produced for a given particle velocity, defined as Z = p / v. Since pressure is in pascals and velocity in meters per second, the resulting unit is pascal-second per cubic meter, a Rayl. The standard symbol for impedance is Z, so the typical pairing is Rayls and Z. Using milli-rayl would be a submultiple, not the conventional unit in this context, and symbols like R or I are not used to denote impedance (R is usually resistance in ohms, I denotes current).

Impedance in acoustics describes how much pressure is produced for a given particle velocity, defined as Z = p / v. Since pressure is in pascals and velocity in meters per second, the resulting unit is pascal-second per cubic meter, a Rayl. The standard symbol for impedance is Z, so the typical pairing is Rayls and Z. Using milli-rayl would be a submultiple, not the conventional unit in this context, and symbols like R or I are not used to denote impedance (R is usually resistance in ohms, I denotes current).