(a(i))[1]
The wavefronts on the right-hand side of the barrier fan out to the dashed lines in Fig. 6.1. State the name of this spreading process.
(a(ii))[2]
Sketch four wavefronts on the right of the barrier.
(b(i))[1]
State the effect of increasing the width of the gap in the barrier.
(b(ii))[2]
State and explain the effect of decreasing the frequency of the water wave.