(a)[1]
State the term used for the reflection of a sound wave or ultrasound wave.
(b)[3]
Calculate the wavelength of the ultrasound wave as it travels through human tissue.
(c(i))[3]
On Fig. 5.2, mark and label one wavelength.
(c(ii))[3]
On Fig. 5.2, draw three crests of the wave after reflection from the barrier.