Exam-style question
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What effect does the random nature of radioactive decay have on measurements of activity?.
- A.Activity remains constant over time.
- B.Activity can vary unpredictably.
- C.Activity is always zero.
- D.Activity is directly proportional to mass.
Model answer
What a good answer should say
- Activity can vary unpredictably..
- the correct option
Explanation
Why this works
The correct answer is Activity can vary unpredictably.. This supports Describe radioactive decay as a random nuclear process.
in Stable and unstable nuclei because it uses the required AQA A-Level Physics idea directly. The other options are less suitable because they either describe a different particle/radiation concept or miss the key condition tested by the question.
Common mistake
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