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5.2 Radioactivity

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Question 107

A radioactive source has a half-life of 15 minutes.

A detector near the source shows a reading of 4800 counts per second.

Background radiation can be ignored.

What is the reading on the detector 1.0 hour later?

A

300300300 counts per second

B

600600600 counts per second

C

120012001200 counts per second

D

240024002400 counts 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.

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