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5.2 Radioactivity

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Question 84

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 Radioactivity Questions

  1. IGCSE
  2. /Physics
  3. /5.2 Radioactivity

484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.

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