Question detail
What is the significance of a decay graph in determining 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 shows the mass of the radioactive material over time
- B. It indicates the temperature changes in the sample
- C. It displays the count rate or activity decreasing over time
- D. It measures the energy released during decay
Answer
The correct answer is C: It displays the count rate or activity decreasing over time.
Explanation
The correct answer is C: It displays the count rate or activity decreasing over time. 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 shows the mass of the radioactive material over time; It indicates the temperature changes in the sample; It measures the energy released during decay.
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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