Question detail
What does a decay curve represent in radioactive decay?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Atoms and nuclear radiation
Question
- A. The relationship between count rate and time
- B. The mass of radioactive material over time
- C. The energy emitted during decay
- D. The type of radiation emitted
Answer
The correct answer is A: The relationship between count rate and time.
Explanation
The correct answer is A: The relationship between count rate and time. This supports the learning objective "Interpret decay curves showing radioactive count rate against time." in Half-lives and the random nature of radioactive decay because it uses the correct atomic and nuclear radiation relationship for Atoms and nuclear radiation. The other options are less suitable because they do not match the required Half-lives and the random nature of radioactive decay idea: The mass of radioactive material over time; The energy emitted during decay; The type of radiation emitted.
Common mistake
Misinterpreting Decay Curves
Students often confuse the shape of the decay curve, thinking it is linear rather than exponential.
Review the characteristics of exponential decay, noting that the count rate decreases rapidly at first and then more slowly over time.
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