Question 1
Lead-209 is a radioactive isotope. It has a half-life of 3.3 hours. Suppose that 40 milligrams of
this isotope is created in an experiment, how much is left after 14 hours? Use the graph to
represent its decay. [ 10 Marks]
Question 2
Radioactive carbon-14 is used to determine the age of artefacts because it concentrates in
organisms only when they are alive. It has a half-life of 5730 years. In 1947, earthenware jars
containing what are known as the Dead Sea Scrolls were found. Analysis indicated that the
scroll wrappings contained 76% of their original carbon-14. Estimate the age of the Dead Sea
Scrolls. [ 10 Marks]
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