A-LevelPhysicsNuclear physicsFeb/Mar 2017Paper 4 Q128 Marks
A stationary nucleus of uranium-238 (²³⁸U) decays to form a nucleus of thorium-234 (²³⁴Th). An α-particle and a gamma-ray photon are emitted. The equation representing the decay is ²³⁸U → ²³⁴Th + ⁴He + γ 92 90 2 The masses of the nuclei are given in Fig. 12.1. nucleus mass/u uranium-238 238.05076 thorium-234 234.04357 helium-4 4.00260 Fig. 12.1
📋 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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