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5.2.4a Half-life

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Question 51

A radioactive isotope has a half-life of 4 hours.

A detector close to a sample of this isotope gives a count rate of 520 counts per minute.

Without the source, the background count rate is 40 counts per minute.

What is the count rate due to the source after 8 hours?

A

120 counts per minute

B

130 counts per minute

C

160 counts per minute

D

240 counts per minute

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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