A-LevelPhysicsSuperpositionOct/Nov 2012Paper 1 Q281 Mark
The diagram shows two identical loudspeakers driven in phase by a common audio-frequency source. [Figure showing two loudspeakers and regions of loud/quiet sound] When a student moves along line XY, she notices that there are variations in the loudness of the sound. The regions in which the sound is heard are alternately loud and quiet as indicated on the diagram. How may the distance between loud regions be reduced?
Adecreasing the distance a between the speakers
Bincreasing distance d
Cincreasing the frequency of the audio-frequency source
Dincreasing the power output from the audio-frequency source
✓ Correct Answer
The correct answer is C: increasing the frequency of the audio-frequency source
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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