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5.2 Radioactivity

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Question 124

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

360 counts are recorded by the counter in 4 minutes.

The background count rate is 25 counts per minute (cpm).

What is the corrected count rate for the radioactive source?

A

65 cpm65\text{ cpm}65 cpm

B

90 cpm90\text{ cpm}90 cpm

C

115 cpm115\text{ cpm}115 cpm

D

335 cpm335\text{ cpm}335 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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