(a)[2]
Define specific acoustic impedance using density and sound speed.
(b)[2]
Explain how a piezoelectric crystal detects ultrasound waves.
(c(i))[2]
Calculate the intensity reflection coefficient when ultrasound is incident on a water-steel boundary.
(c(ii))[2]
Explain, without calculation, what is likely to happen when ultrasound is incident on a body tissue-water boundary.