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5.2 Radioactivity

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Question 34

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

A

Half of the time taken for the activity of the isotope to fall to zero

B

The time taken for all the radioactive nuclei in a sample to decay

C

The time taken for the activity of the isotope to decrease to half of its initial value

D

Half of the time taken for the number of radioactive nuclei to halve

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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