(a)[2]
Describe how reflected ultrasound pulses can be used to provide diagnostic information about structures inside the body.
(b(i))[2]
Define the specific acoustic impedance of a medium.
(b(ii))[3]
Table 10.1 gives data for water and glass. The density of water is $1000\,\text{kg m}^{-3}$ and the speed of sound in water is $1420\,\text{m s}^{-1}$. The density of glass is $2500\,\text{kg m}^{-3}$ and the speed of sound in glass is $4560\,\text{m s}^{-1}$. Determine the intensity reflection coefficient for ultrasound incident on a water-glass boundary.