A-LevelPhysicsSuperpositionFeb/Mar 2025Paper 1 Q281 Mark
The diagram shows a water wave in a shallow tank. The wave is diffracted through a gap in a barrier and spreads. The wavelength of the wave is much smaller than the width of the gap. [Figure 28.1] The wavelength of the wave and the width of the gap are both changed by a small amount. Which combination of changes must increase the amount of spreading due to diffraction?
Awavelength: decreases, width of gap: decreases
Bwavelength: decreases, width of gap: increases
Cwavelength: increases, width of gap: decreases
Dwavelength: increases, width of gap: increases
✓ Correct Answer
The correct answer is C: wavelength: increases, width of gap: decreases
📋 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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