A-LevelPhysicsWavesOct/Nov 2016Paper 1 Q241 Mark
A transverse progressive wave of wavelength λ is set up on a stretched string. The graph shows the variation of displacement y with distance x at a particular instant of time. The displacement where distance x = λ/8 is y₁. [Figure 24.1] What are the next two values of x where the displacement y is again equal to y₁?
A3λ/8 and 5λ/8
B3λ/8 and 9λ/8
C5λ/8 and 9λ/8
D9λ/8 and 17λ/8
✓ Correct Answer
The correct answer is B: 3λ/8 and 9λ/8
📋 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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