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5.2 Radioactivity

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Question 78

The reading on a detector placed near a radioactive material is 840 counts per second840\text{ counts per second}840 counts per second.

The background count rate is 40 counts per second40\text{ counts per second}40 counts per second.

The half-life of the radioactive material is 12 days12\text{ days}12 days.

What is the reading on the detector after 36 days36\text{ days}36 days?

A

40 counts per second40\text{ counts per second}40 counts per second

B

100 counts per second100\text{ counts per second}100 counts per second

C

145 counts per second145\text{ counts per second}145 counts per second

D

140 counts per second140\text{ counts per second}140 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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