(a(i))[1]
Show that the specific acoustic impedance of gel comes to $1.68 \times 10^{6}\,\text{kg m}^{-2}\text{s}^{-1}$.
(a(ii))[2]
Complete Table 8.1 by finding the missing values to three significant figures. Use the space below for any working you need.
(b(i))[2]
Use the information in (a) to calculate the intensity reflection coefficient for an air-tissue boundary.
(b(ii))[1]
Use the information in (a) to calculate the intensity reflection coefficient for a gel-tissue boundary.
(c)[2]
Use your answers in (b) to explain why gel is applied to the skin during ultrasound scanning.