State the meaning of the frequency of the source.
State the distance travelled, in terms of $\lambda$, by a wavefront after $n$ oscillations of the source.
Using your answers in (i), deduce an expression for the wave speed $v$ in terms of $f$ and $\lambda$.
Fig. 5.1 shows the waveform of a sound wave displayed on the screen of a cathode-ray oscilloscope (c.r.o.). The time-base setting of the c.r.o. is $2.0\ \text{ms cm}^{-1}$. Determine the frequency of the sound wave.
A second sound wave has the same frequency as that found in (i). Both waves have the same amplitude, but the phase difference between them is $90^\circ$. On Fig. 5.1, sketch the waveform of this second wave.
Determine the frequency of the sound wave.
A second sound wave has the same frequency as that found in (i). The amplitude of the two waves is the same, but the phase difference between them is $90^\circ$. On Fig. 5.1, draw the waveform of this second wave.