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A-LevelPhysicsNuclear physicsMay/June 2019Paper 4 Q129 Marks

(a) A sample of a radioactive isotope contains N nuclei of the isotope at time T. At time (T + ∆T), the sample contains (N – ∆N) nuclei of the isotope. The time interval ∆T is short. Use the symbols N, ∆N, T and ∆T to give expressions for:

Q: What topic does this question test?

This question tests Nuclear physics in A-Level Physics (syllabus code 9702). It is worth 9 marks.

📋 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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About This A-Level Physics Question

Topic

This structured question tests Nuclear physics in A-Level Physics (syllabus code 9702). It is worth 9 marks.

Source

This question appeared in the Cambridge A-Level Physics May/June 2019 examination, Paper 4 Variant 1.

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