A-LevelPhysicsWavesMay/June 2010Paper 1 Q231 Mark
Diagram 1 shows a ripple tank experiment in which plane waves are diffracted through a narrow slit in a metal sheet. Diagram 2 shows the same tank with a slit of greater width. In each case, the pattern of the waves incident on the slit and the emergent pattern are shown. [Figure 23.1] Which action would cause the waves in diagram 1 to be diffracted less and so produce an emergent pattern closer to that shown in diagram 2?
Aincreasing the frequency of vibration of the bar
Bincreasing the speed of the waves by making the water in the tank deeper
Creducing the amplitude of vibration of the bar
Dreducing the length of the vibrating bar
✓ Correct Answer
The correct answer is A: increasing the frequency of vibration of the bar
📋 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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