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5.2 Radioactivity

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Question 19

A radioactive isotope has a half-life of 6 hours.

A detector placed near a sample of this isotope measures a count rate of 320 counts per minute. The background count rate is 40 counts per minute.

What is the count rate due to the source after 6 hours?

A

120 counts per minute120\text{ counts per minute}120 counts per minute

B

140 counts per minute140\text{ counts per minute}140 counts per minute

C

160 counts per minute160\text{ counts per minute}160 counts per minute

D

180 counts per minute180\text{ counts per minute}180 counts per minute

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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