A-LevelPhysicsWavesFeb/Mar 2022Paper 1 Q261 Mark
Water waves of wavelength λ are formed in a ripple tank. The waves are diffracted as they pass through a narrow gap of width d (d is greater than λ). Which gap width and which wavelength will cause the largest decrease in the amount of diffraction? gap width wavelength A ¹/₂d ¹/₂λ B ¹/₂d 2λ C 2d ¹/₂λ D 2d 2λ
A¹/₂d, ¹/₂λ
B¹/₂d, 2λ
C2d, ¹/₂λ
D2d, 2λ
✓ Correct Answer
The correct answer is C: 2d, ¹/₂λ
📋 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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