(a)[1]
In one type of wave, the vibration direction is parallel to the direction of motion of the wave. State the name of this wave type.
(b(i))[2]
On Fig. 7.1, draw three wavefronts to the right of the barrier.
(b(ii))[1]
On Fig. 7.1, show and label one wavelength.
(c)[3]
Determine the frequency of the wave.