A-LevelPhysicsSuperposition9702/12 · Feb/Mar 2019 · Q281 Mark
Two identical loudspeakers are connected in series to an a.c. supply, as shown. [Figure 28.1] A microphone is moved along the line PQ. Which graph best shows the variation with distance from P of the intensity of the sound detected by the microphone?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A[Graph A: intensity vs distance, showing constructive and destructive interference, starting with high intensity at P and gradually decreasing overall amplitude]
B[Graph B: intensity vs distance, starting high, with peaks and troughs, but overall constant maximum intensity]
C[Graph C: intensity vs distance, starting low, with peaks and troughs, but overall constant maximum intensity]
D[Graph D: intensity vs distance, starting low, with peaks and troughs, and gradually decreasing overall amplitude]
✓ Correct answer
A: [Graph A: intensity vs distance, showing constructive and destructive interference, starting with high intensity at P and gradually decreasing overall amplitude]
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