A-LevelPhysicsSuperpositionFeb/Mar 2019Paper 1 Q271 Mark
P and Q are fixed points at the end of a string. A transverse stationary wave of constant maximum amplitude is formed on the string. [Figure 27.1] P, R and Q are the only points on the string where nodes are formed. S and T are two points on the string at a distance x from R. What is the relationship between points S and T?
Athe same amplitude and in phase
Bdifferent amplitudes and in phase
Cthe same amplitude and a phase difference of 180°
Ddifferent amplitudes and a phase difference of 180°
✓ Correct Answer
The correct answer is C: the same amplitude and a phase difference of 180°
📋 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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