The top row of bars represents a set of particles inside the Earth and at rest. The lower row represents the same particles at one instant as a longitudinal wave passes from left to right through the Earth. [Figure 23.1] What should be measured to determine the amplitude of the oscillations of the particles in the lower row as the wave passes?
✓ Correct Answer
The correct answer is C: the maximum displacement of the particles from their position at rest
📋 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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