A-LevelPhysicsNuclear physicsMay/June 2018Paper 1 Q381 Mark
In the α-particle scattering experiment, a beam of α-particles is aimed at a thin gold foil. Most of the α-particles go straight through or are deflected by a small angle. A very small proportion are deflected through more than 90°, effectively rebounding towards the source of the α-particles. Which conclusion about the structure of atoms cannot be drawn from this experiment alone?
AMost of the atom is empty space.
BMost of the mass of an atom is concentrated in the nucleus.
CThe nucleus contains both protons and neutrons.
DThe nucleus is charged.
✓ Correct Answer
The correct answer is C: The nucleus contains both protons and neutrons.
📋 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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