(a) Using the values for density and the speed of ultrasound given in Table 17.5, show that the acoustic impedance of fat tissue is indeed 1.34 x 10⁶ kg/(m².s).

(b) Calculate the intensity reflection coefficient of ultrasound when going from fat to muscle tissue.

Strategy for (a) 

The acoustic impedance can be calculated using Z = pv and the values for p and v found in Table 17.5.

Strategy for (b)
The intensity reflection coefficient for any boundary between two media is given by , and the acoustic impedance of muscle is given in Table 17.5.

Data given in Table 17.5

Transcribed Image Text:

a = z(¹z-²z) 2 (Z₁ + Z₂)²