Impedance

Question 1

Acoustic impedance is a property of the ____ and has units of ____.

a. source and medium, Imps
b. medium, dB
c. medium, Rayls
d. medium, Ohms

Answer 1

c. medium, Rayls

Question 2

To calculate the acoustic impedance of a medium, one should ___ the ___ by the ___.

a. divide, propagation speed, density
b. multiply, density, propagation speed.
c. divide, density, propagation speed
d. multiply, stiffness, density

Answer 2

b. multiply, density, propagation speed

Question 3

Which two attributes help establish the acoustic impedance of a medium?

a. density and temperature
b. density and stiffness
c. stiffness and elastance
d. elasticity and compressibility

Answer 3

b. density and stiffness

Question 4

Which value is closest to the impedance of soft tissue?

a. 1.5 kiloRayls
b. 2.5 deciRayls
c. 19 megaRayls
d. 2,000,000 Rayls

Answer 4

d. 2,000,000 Rayls