Physics 9702 · AS & A Level · Progressive waves

Progressive waves — practice question

A travelling progressive wave $Y$ moves past point $P$. Figure 5.1 shows how the displacement $x$ of the wave at $P$ changes with time $t$. The wavelength of the wave is $8.0\,\text{cm}$.
(a)[2]

Calculate the speed of the wave.

(b)[3]

A second wave $Z$ has wavelength $8.0\,\text{cm}$ and amplitude $2.0\,\text{mm}$ at point $P$. Waves $Y$ and $Z$ travel with the same speed. For the waves at point $P$, calculate the ratio $\frac{\text{intensity of wave } Z}{\text{intensity of wave } Y}$.

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This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “applies $v = \dfrac{\lambda}{T}$ or $v = f\lambda$ with $f = \dfrac{1}{T}$” …

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