Cambridge International AS & A Level Physics · A2 23 · data analysis
Exponential decay of a mineral
Nuclear physics · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- discriminating
- Marks
- 6
- Topics
- 3
- Answer
- Complete
Question6 marks
A mineral has half-life 6 h and initial activity 3400 Bq. Calculate the decay constant in h⁻¹ and the activity after 16.8 h.
Task interpretation
What a complete response should do
Identify the useful evidence, process it with units, and make only the conclusion the data supports.
Make assumptions explicit, connect several ideas, and test whether the final result is physically reasonable.
- Response type
- data analysis
- Allocation
- 6 marks
- Demand
- discriminating
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