A source has an activity of Bq. Calculate its activity after half-lives.
Salam Academy Original Practice · Proposed mark scheme
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12 questions
The activity of a sample falls from counts/min to counts/min in days. Calculate the half-life in days.
Salam Academy Original Practice · Proposed mark scheme
What fraction of a radioactive sample remains after half-lives? Give your answer as a decimal.
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A smoke alarm contains a source that emits
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Which is a safe way to handle a radioactive source in a school laboratory?
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A g sample of an isotope decays for half-lives. Calculate the mass of the isotope remaining.
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The half-life of a radioactive isotope is the time taken for
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Ionising radiation is harmful to living things mainly because it
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An isotope has a half-life of hours. How long does it take for g of it to decay until g remains?
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A radioactive tracer injected into a patient should be
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A factory monitors the thickness of paper with a radioactive source and detector. The source should emit
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A piece of wood from an ancient boat contains of the carbon-14 found in living wood. Carbon-14 has a half-life of years. Estimate the age of the wood, in years.
Salam Academy Original Practice · Proposed mark scheme