Physics · Oct / Nov 2016 · Paper 11 · Question 39
5054Half-life
A freshly made sample of radioactive material gives a count rate of 8000 counts per minute. After 20 days, it gives a count rate of 500 counts per minute. What is the half-life of the material?
- A4.0 days
- B5.0 days
- C20 days
- D80 days
As printed in the paper
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Correct answer: B. 5.0 days
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