Physics · Oct / Nov 2023 · Paper 12 · Question 39
5054Half-life
The half-life of a radioactive isotope is 2.5 minutes. This isotope is the only radioactive isotope in a radioactive sample. Between time t = 0 and t = 7.5 minutes, the mass of this isotope in the sample decreases by 70 µg. What is the mass of this isotope at t = 0?
- A75 µg
- B80 µg
- C210 µg
- D560 µg
As printed in the paper
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Correct answer: B. 80 µg
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