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5.2 Radioactivity

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Question 17

A radioactive source has a half-life of 5.0 years5.0\text{ years}5.0 years. It currently emits radiation at a rate of 900 particles per second900\text{ particles per second}900 particles per second. At what rate was it emitting radiation 15.0 years15.0\text{ years}15.0 years earlier?

A

112.5 particles per second112.5\text{ particles per second}112.5 particles per second

B

1800 particles per second1800\text{ particles per second}1800 particles per second

C

3600 particles per second3600\text{ particles per second}3600 particles per second

D

7200 particles per second7200\text{ particles per second}7200 particles per second

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.

Question bank