May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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37Half Life Exponential DecayMedium1 mark
A radioactive isotope has a half-life of 8.0 days. A detector close to a sample of this isotope gives a count rate of 200 counts per minute. Without the source, the background count is 20 counts per minute. What is the count rate due to the source after 8.0 days?