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5.2 Radioactivity

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Question 55

A radioactive source is placed near a radiation detector connected to a counter.

A total of 480 counts are recorded by the counter in 6 minutes.

The background count rate is 25 cpm25\text{ cpm}25 cpm (counts per minute).

What is the corrected count rate for the radioactive source?

A

55 cpm55\text{ cpm}55 cpm

B

80 cpm80\text{ cpm}80 cpm

C

105 cpm105\text{ cpm}105 cpm

D

455 cpm455\text{ cpm}455 cpm

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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