(a)[1]
Determine the carrier-wave frequency.
(b)[3]
Using the axes in Fig. 6.2, sketch the frequency spectrum of the modulated wave.
Physics 9702 · AS & A Level · Characteristics of alternating currents
Characteristics of alternating currents — practice question
Fig. 6.1 gives the displacement of an amplitude-modulated (AM) wave as a function of time. The sinusoidal information signal has frequency $10\,\text{kHz}$.
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This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “period $= 5.0\,\mu\text{s}$, so frequency $=2.0\times10^5\,\text{Hz}$” …
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