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5.2.4a Half-life

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Question 36

The count rate from a radioactive isotope is recorded every minute. The count rate is corrected for background radiation.

The table shows the readings:

time / minutes012345corrected count rate / counts/s1200980810660540450 \begin{array}{|c|c|c|c|c|c|c|} \hline \text{time / minutes} & 0 & 1 & 2 & 3 & 4 & 5 \\ \hline \text{corrected count rate / counts/s} & 1200 & 980 & 810 & 660 & 540 & 450 \\ \hline \end{array} time / minutescorrected count rate / counts/s​01200​1980​2810​3660​4540​5450​​

What estimate of the half-life of the isotope can be obtained from the readings in the table?

A

between 1 and 2 minutes

B

between 2 and 3 minutes

C

between 3 and 4 minutes

D

between 4 and 5 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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