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5.2 Radioactivity

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Question 24

A radioactive isotope has a half-life of 15 hours15\text{ hours}15 hours. It emits radiation at a rate of 800 particles per second800\text{ particles per second}800 particles per second. How long does it take for the rate of emission to fall to 100 particles per second100\text{ particles per second}100 particles per second?

A

15 hours15\text{ hours}15 hours

B

30 hours30\text{ hours}30 hours

C

45 hours45\text{ hours}45 hours

D

60 hours60\text{ hours}60 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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