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5.2 Radioactivity

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Question 257

A sample of a radioactive material has a half-life of 15 minutes15\text{ minutes}15 minutes.

Which statement is correct?

A

After 10 minutes, more than half of the material has decayed.

B

After 30 minutes, a quarter of the radioactive material remains.

C

After 45 minutes, a sixth of the radioactive material remains.

D

After 60 minutes, all of the radioactive material has decayed.

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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