(a(i))[2]
Explain what is meant by a progressive transverse wave. Progressive: Transverse:
(a(ii))[1]
Define frequency.
(b(i))[1]
Fig. 7.1 shows five labelled points. Use Fig. 7.1 to state any two points with a phase difference of zero.
(b(ii))[1]
Fig. 7.1 shows five labelled points. Use Fig. 7.1 to state any two points with a phase difference of $270^{\circ}$.
(c)[3]
The frequency of the wave in (b) is $15\,\text{Hz}$. Calculate the speed of the wave in (b).
(d)[2]
Two waves with the same frequency have amplitudes $1.4\,\text{cm}$ and $2.1\,\text{cm}$. Calculate the ratio $\dfrac{\text{intensity of wave of amplitude }1.4\,\text{cm}}{\text{intensity of wave of amplitude }2.1\,\text{cm}}$.