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5.2.4a Half-life

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Question 44

Strontium-90 is a radioactive nuclide. The nuclide notation for a nucleus of strontium-90 is

3890Sr ^{90}_{38}\text{Sr} 3890​Sr
a.

Determine the number of:

  • protons in one nucleus of strontium-90,
  • neutrons in one nucleus of strontium-90.
[2]
b.

Strontium-90 has a half-life of 28 years. A radioactive source contains 16 mg of strontium-90. Calculate the mass of strontium-90 that remains in the source after 84 years.

[2]
Markscheme

5.2.4a Half-life Questions

  1. IGCSE
  2. /Physics
  3. /5.2.4a Half-life

144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.

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