Exam-style question
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In a decay graph, what does the half-life represent?.
- A.The time taken for the activity to double
- B.The time taken for half of the radioactive nuclei to decay
- C.The time taken for the activity to become zero
- D.The time taken for the substance to reach a stable state
Model answer
What a good answer should say
- The time taken for half of the radioactive nuclei to decay
Explanation
Why this works
The evidence indicates that the half-life is defined as the time required for half of the radioactive nuclei in a sample to decay. This shows that after each half-life, the remaining amount of the substance is halved.
The implication is that this property is crucial for understanding the stability and longevity of radioactive materials. Therefore, the conclusion is that half-life is a key concept in nuclear physics that helps predict the behavior of radioactive substances over time.
Common mistake
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