A-LevelPhysicsForces, density and pressureMay/June 2019Paper 1 Q211 Mark
The diagram shows the arrangement of atoms in a particular crystal. [Figure 21.1] Each atom is at the corner of a cube. The mass of each atom is 3.5 × 10⁻²⁵ kg. The density of the crystal is 9.2 × 10³ kg m⁻³. What is the shortest distance between the centres of two adjacent atoms?
A3.8 × 10⁻²⁹ m
B6.2 × 10⁻¹⁵ m
C3.4 × 10⁻¹⁰ m
D3.0 × 10⁻⁹ m
✓ Correct Answer
The correct answer is C: 3.4 × 10⁻¹⁰ m
📋 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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