Physics · Oct / Nov 2020 · Paper 11 · Question 40
5054Half-life
An isotope P is radioactive and has a half-life of 7.0 years. A sample initially contains 0.016 kg of P. After how long will the sample contain 0.0020 kg of P?
- A7.0 years
- B14 years
- C21 years
- D28 years
As printed in the paper
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Correct answer: C. 21 years
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