Multiple Choice
Which isotope is most commonly used to date ancient remains (once-living organic materials) using radioactive half-life principles?
17. Radioactivity and Nuclear Chemistry
Radioactive Half-Life
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What is the half-life of the radioisotope that shows the following plot of remaining percentage vs. time?
A
3 days
B
5 days
C
4 days
D
10 days
Verified step by step guidance1
Identify the initial percentage of the sample remaining, which is typically 100% at time zero.
Determine the percentage of the sample remaining when it is reduced to half of its initial value, which is 50%.
Locate the point on the graph where the sample remaining is 50% and note the corresponding time on the x-axis.
The time at which the sample remaining is 50% is the half-life of the radioisotope.
Verify the half-life by checking if the time it takes for the sample to reduce from 50% to 25% is the same as the time from 100% to 50%.
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