Exam-style question
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In the context of nuclear decay, what does the term 'half-life' refer to?.
- A.The time taken for half of the radioactive nuclei to decay.
- B.The time taken for all radioactive nuclei to decay.
- C.The time taken for the activity to double.
- D.The time taken for the mass of the substance to halve.
Model answer
What a good answer should say
- The time taken for half of the radioactive nuclei to decay.
Explanation
Why this works
Half-life is defined as the time required for half of the radioactive nuclei in a sample to decay. This concept is crucial for understanding the stability and decay rates of radioactive materials.
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