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5.2 Radioactivity

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Question 182

A sample of a radioactive material has a half-life of 15 minutes15\text{ minutes}15 minutes. Which statement is correct?

A

After 20 minutes20\text{ minutes}20 minutes, more than half of the material remains.

B

After 30 minutes30\text{ minutes}30 minutes, half of the radioactive material has decayed.

C

After 45 minutes45\text{ minutes}45 minutes, an eighth of the radioactive material remains.

D

After 60 minutes60\text{ minutes}60 minutes, a tenth of the radioactive material remains.

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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