A-LevelPhysicsSuperpositionOct/Nov 2015Paper 1 Q281 Mark
The diagram shows a tuning fork above a tube of air of length 25 cm. [Figure showing a tuning fork above a tube of air, length 25 cm, sealed at the bottom] A stationary wave is set up in the tube with the same frequency as the tuning fork. The lower end of the tube is sealed. This is the minimum length of tube with the lower end sealed that creates a stationary wave. Which other lengths of tubes, sealed at their lower end, will also create a stationary wave?
A37.5 cm and 50 cm
B50 cm and 75 cm
C75 cm and 100 cm
D75 cm and 125 cm
✓ Correct Answer
The correct answer is D: 75 cm and 125 cm
📋 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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