(a)[1]
Define the frequency of a sound wave.
(b)[1]
A sound wave travels through air. Describe the motion of the air particles compared with the direction in which the sound wave travels.
(c(i))[2]
Use Fig. 5.1 to find the frequency of the sound wave. The $y$-axis setting is $5.0\ \text{mV cm}^{-1}$ and the time-base setting is $0.50\ \text{ms cm}^{-1}$.
(c(ii).1)[3]
The horn of the car sounds continuously. Describe the changes to the trace seen on the c.r.o. as the car travels at constant speed directly towards the stationary microphone.
(c(ii).2)[3]
The horn of the car sounds continuously. Describe the changes to the trace seen on the c.r.o. as the car travels at constant speed directly away from the stationary microphone.