Exam-style question
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What happens to the activity of a radioactive sample as time increases?.
- A.It remains constant.
- B.It increases exponentially.
- C.It decreases exponentially.
- D.It decreases linearly.
Model answer
What a good answer should say
- It decreases exponentially.
Explanation
Why this works
The activity of a radioactive sample decreases exponentially over time due to the random nature of decay events, which is characterized by the decay constant. This behavior is fundamental to the concept of radioactive decay.
Common mistake
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