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5.2 Radioactivity

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Question 94

The half-life of a radioactive substance is 15 minutes. A sample of the radioactive substance contains 3000 nuclei. How many radioactive nuclei were in the sample one hour earlier?

A

188188188

B

12 00012\,00012000

C

24 00024\,00024000

D

48 00048\,00048000

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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