Question detail
What happens to the count rate after one half-life?
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. It remains the same
- B. It doubles
- C. It increases by a fixed amount
- D. It halves
Answer
The correct answer is D: It halves.
Explanation
The correct answer is D: It halves. This supports the learning objective "Determine half-life from a decay graph." 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: It remains the same; It doubles; It increases by a fixed amount.
Common mistake
Misinterpreting Decay Graphs
Students often misread the decay graph, confusing the time axis with the count rate axis, leading to incorrect half-life determination.
Carefully label and analyze the axes of the decay graph, ensuring to identify the count rate and the time correctly before calculating the half-life.
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