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5.2.4a Half-life

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Question 35

The count rate due to a sample of a radioactive isotope is measured for 75 minutes.

Time / minutesCount rate / (counts/second)06401551030400453206025075200 \begin{array}{|c|c|} \hline \text{Time / minutes} & \text{Count rate / (counts/second)} \\ \hline 0 & 640 \\ 15 & 510 \\ 30 & 400 \\ 45 & 320 \\ 60 & 250 \\ 75 & 200 \\ \hline \end{array} Time / minutes01530456075​Count rate / (counts/second)640510400320250200​​

What is the half-life of the isotope?

A

15 minutes15\text{ minutes}15 minutes

B

30 minutes30\text{ minutes}30 minutes

C

45 minutes45\text{ minutes}45 minutes

D

75 minutes75\text{ minutes}75 minutes

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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