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5.2 Radioactivity

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Question 196

Which statement correctly defines the half-life of a radioactive source?

A

The time taken for the activity of the source to fall to half of its original value.

B

Half the time taken for the activity of the source to fall to zero.

C

The time taken for all the radioactive nuclei in the source to decay.

D

The time taken for a single nucleus to split into two smaller nuclei.

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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