k 09 – Radioactivity and Half Life
9
Part A
A wooden object from the site of an ancient temple has a carbon-14 activity of 15 counts/min compared with a reference piece of wood cut today that has an activity of 60 counts/min. If the half-life for carbon-14 is 5730 years, what is the age
the ancient wood object?
Express your answer in years to two significant figures.
16] ΑΣΦ
17000
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After each half-life, one-half of the sample decays. For each half-life, divide the current activity of 60 counts/min by half until the carbon-14 activity is 15 counts/min This will allow you to determine the correct number of half-lives
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