A-LevelPhysicsForces, density and pressureMay/June 2011Paper 1 Q211 Mark
Two solid substances P and Q have atoms of mass M_P and M_Q respectively. They have n_P and n_Q atoms per unit volume. The density of P is greater than the density of Q. What must be correct?
AM_P > M_Q
Bn_P > n_Q
CM_P n_P > M_Q n_Q
DM_P / n_P > M_Q / n_Q
✓ Correct Answer
The correct answer is C: M_P n_P > M_Q n_Q
📋 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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