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5.2.4a Half-life

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Question 53

A radioactive isotope has a half-life of 6 hours6\text{ hours}6 hours.

A detector close to a sample of this isotope gives a count rate of 450 counts per minute450\text{ counts per minute}450 counts per minute.

Without the source, the background count is 30 counts per minute30\text{ counts per minute}30 counts per minute.

What is the count rate due to the source after 12 hours12\text{ hours}12 hours?

A

105 counts per minute105\text{ counts per minute}105 counts per minute

B

112.5 counts per minute112.5\text{ counts per minute}112.5 counts per minute

C

135 counts per minute135\text{ counts per minute}135 counts per minute

D

210 counts per minute210\text{ counts per minute}210 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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