Physics · Oct / Nov 2023 · Paper 11 · Question 38
5054Half-life
The isotope radon-222 has a half-life of 3.8 days. Which statement about a sample containing 1.0 mg of radon-222 is correct?
- AAfter 1.9 days there is 0.50 mg of radon-222 left.
- BAfter 3.8 days there is 0.50 mg of radon-222 left.
- CIts half-life is half that of a 2.0 mg sample.
- DThere is no radon-222 left after 7.6 days.
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Correct answer: B. After 3.8 days there is 0.50 mg of radon-222 left.
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