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5.2.4a Half-life

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Question 41

The reading on a detector placed near a radioactive material is 840 counts per second840\text{ counts per second}840 counts per second.

The background count rate is 40 counts per second40\text{ counts per second}40 counts per second.

The half-life of the radioactive material is 12 days12\text{ days}12 days.

What is the reading on the detector after 36 days36\text{ days}36 days?

A

40 counts per second40\text{ counts per second}40 counts per second

B

100 counts per second100\text{ counts per second}100 counts per second

C

145 counts per second145\text{ counts per second}145 counts per second

D

140 counts per second140\text{ counts per second}140 counts per second

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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