The diagram shows a stationary wave, at time t = 0, that has been set up on a string fixed between points P and S. [Diagram] The nodes of the stationary wave occur on the string at P, Q, R and S. Point X is moving down at time t = 0. The points on the string vibrate with time period T and maximum amplitude 2 cm. The displacement s is positive in the upward direction. Which graph best shows the variation with t of the displacement s of point Y on the string?
✓ Correct Answer
The correct answer is A: Graph of displacement s vs time t, starting at 0, decreasing to negative maximum at T/4, returning to 0 at T/2, increasing to positive maximum at 3T/4, returning to 0 at T.
📋 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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