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5.2.4a Half-life

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Question 47

An isotope of iodine has a half-life of 20 h.

The table gives data from an experiment to show how the rate of decay of the isotope varies with time.

The background count rate has not been subtracted from these data.

Time / h010203040Count rate / counts/s510370270200150 \begin{array}{|c|c|c|c|c|c|}\hline\text{Time } / \text{ h} & 0 & 10 & 20 & 30 & 40 \\\hline\text{Count rate } / \text{ counts/s} & 510 & 370 & 270 & 200 & 150 \\\hline\end{array} Time / hCount rate / counts/s​0510​10370​20270​30200​40150​​

What is the background radiation count rate?

A

15 counts/s15\text{ counts/s}15 counts/s

B

20 counts/s20\text{ counts/s}20 counts/s

C

30 counts/s30\text{ counts/s}30 counts/s

D

45 counts/s45\text{ counts/s}45 counts/s

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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