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5.2 Radioactivity

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Question 73

A sample of a radioactive isotope emits particles at a rate of 480 per minute.

After 60 hours the rate of emission has decreased to 30 per minute.

What is the half-life of the radioactive material?

A

10 hours

B

12 hours

C

15 hours

D

20 hours

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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