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Approximately how old is a fossil that contains 3.13% of its original carbon-14? The half-life of carbon-14 is 5730 years.
What percentage of a radioactive sample remains after four half-lives have passed?
If 75.0 mg of potassium-42 was administered to a patient at 10 AM on Monday, how many mg will remain at 10 AM on Thursday of that same week? The half life of K-42 is 12 hours.
The half-life of nickel-65 is 2.50 days. How much of a 100.-g sample remains after 7.50 days?