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5.2.4a Half-life

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Question 24

The half-life for plutonium-239 is 24 000 years24\,000\text{ years}24000 years.

A sample of plutonium-239 produces 640 counts/s640\text{ counts/s}640 counts/s.

How long will it take for the count rate to drop to 80 counts/s80\text{ counts/s}80 counts/s?

A

48 000 years48\,000\text{ years}48000 years

B

72 000 years72\,000\text{ years}72000 years

C

96 000 years96\,000\text{ years}96000 years

D

192 000 years192\,000\text{ years}192000 years

Markscheme

5.2.4a Half-life Questions

  1. IGCSE
  2. /Physics
  3. /5.2.4a Half-life

144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.

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