A-LevelPhysicsSuperpositionFeb/Mar 2019Paper 1 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?
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
The correct answer is A. This question tests the candidate's understanding of superposition within the Physicssyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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