A-LevelPhysicsSuperpositionOct/Nov 2022Paper 1 Q261 Mark
The wavelength of sound in air may be determined by using stationary waves. In one experiment, a loudspeaker produces a sound wave of constant frequency which is reflected directly back along its original path by a metal plate approximately 1m away. A microphone connected to a cathode-ray oscilloscope (CRO) is moved between the loudspeaker and plate to identify regions of high sound intensity ('loud' spots) and low sound intensity ('quiet' spots). The wavelength of the sound is determined using the least possible number of measured quantities. Which row shows the quantities that are needed?
A✓ and X and X
B✓ and X and ✓
CX and ✓ and X
DX and ✓ and ✓
✓ Correct Answer
The correct answer is D: X and ✓ and ✓
📋 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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