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Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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12 questions

SA-9702-NP2-0011 markL1 FoundationCalculatorHalf-life
A nuclide has a half-life of 8.08.0 days. Calculate its decay constant, in units of 10−610^{-6} s⁻¹.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0021 markL1 FoundationCalculatorActivity
A sample has 5.0×10205.0\times10^{20} undecayed nuclei and decay constant 1.0×10−61.0\times10^{-6} s⁻¹. Calculate its activity, in units of 101410^{14} Bq.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0041 markL1 FoundationCalculatorActivity
Radioactive decay is described as spontaneous because
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0051 markL1 FoundationCalculatorActivity
Evidence that radioactive decay is random comes from
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0061 markL1 FoundationCalculatorHalf-life
A source has an activity of 16001600 Bq. Calculate its activity after 44 half-lives.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0091 markL1 FoundationCalculatorActivity
The decay constant of a nuclide is
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0121 markL1 FoundationCalculatorHalf-life
The half-life of a radioactive nuclide is the time taken for
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0032 marksL2 StandardCalculatorHalf-life
A sample has a half-life of 6.06.0 hours. Calculate the percentage remaining after 2020 hours.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0071 markL2 StandardCalculatorActivity
A detector reads 380380 counts per minute near a source. The background is 2020 counts per minute. After one half-life of the source, calculate the expected reading.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0081 markL2 StandardCalculatorHalf-life
A graph of ln⁡A\ln A against time for a radioactive source has gradient
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0102 marksL2 StandardCalculatorHalf-life
The activity of a source falls from 800800 Bq to 200200 Bq in 3030 minutes. Calculate its half-life, in minutes.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-NP2-0113 marksL3 ExamCalculatorHalf-life
Carbon-14 has a half-life of 57305730 years. A wooden sample has 35%35\% of the carbon-14 activity of living wood. Calculate its age, in years.

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Salam Academy Original Practice · Proposed mark scheme