Junior Lyceum Annual Examinations In Physics Form 5 - 2011 Page 9
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11e.
A radioactive sample Y is placed in front an appropriate instrument and the count rate
recorded. A graph of the corrected count rate n in counts per minute is plotted
against time in days as shown:
Graph of activity n in counts/minute against time t in days
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Time t (days)
i.
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Explain the term half-life.
ii.
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Use the graph to determine the half-life of radioactive sample Y.
iii.
What is the corrected count rate of the radioactive sample Y after 12 days? Show your
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working.
Physics – Junior Lyceum – Form 5 – 2011
Page 9 of 11
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