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5.2 Radioactivity

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Question 245

A radioactive isotope has a half-life of 40 minutes40\text{ minutes}40 minutes. The activity (number of emissions per second), AAA, of a sample of this isotope is measured at a certain time. What was the activity of the sample 80 minutes80\text{ minutes}80 minutes earlier?

A

A/4A/4A/4

B

A/2A/2A/2

C

2A2A2A

D

4A4A4A

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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