Question 1
The graph below shows the decay of a radioactive isotope over time. Which value best represents the half-life of this isotope?
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Physics · Unit 1 · Ionising radiation and nuclear reactions · Nuclear model and stability
Examine exponential decay graphs and use these graphs to estimate half -lives.
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Question 2
A radioactive isotope has an initial activity of 12,000 Bq. The graph shows the activity of this isotope over time. What can be inferred about the half-life from the decay pattern shown?
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Question 3
A sample of the radioactive isotope cobalt-60 decays according to an exponential decay curve. The graph shows the number of nuclei remaining versus time. The initial number of nuclei is $N_0 = 8{,}000$. After 5.27 years, the number remaining is 4{,}000. Use the graph to estimate the half-life of cobalt-60 and explain how you determined your answer.
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