A-LevelPhysicsWavesOct/Nov 2018Paper 2 Q47 Marks
(a) Sound waves are longitudinal waves. By reference to the direction of propagation of energy, state what is meant by a longitudinal wave. (b) A stationary sound wave in air has amplitude A. In an experiment, a detector is used to determine A². The variation of A² with distance x along the wave is shown in Fig. 4.1. [Figure 4.1]
📋 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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