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5.2 Radioactivity

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Question 77

The table shows the contribution to background radiation from four common sources in a certain region:

SourcePercentage of total background radiation (%)
Radon gas (in the air)47
Medical uses15
Cosmic rays12
Food and drink10

Which percentage of background radiation comes from all other sources?

A

12%12\%12%

B

16%16\%16%

C

24%24\%24%

D

84%84\%84%

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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