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5.2 Radioactivity

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Question 341

A sample of radium-226 decays and changes into radon-222. The half-life of radium-226 is 1600 years.

Which fraction of the radium-226 will remain after 4800 years?

A

14\frac{1}{4}41​

B

18\frac{1}{8}81​

C

116\frac{1}{16}161​

D

132\frac{1}{32}321​

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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