What would be a good radioactive isotope to determine the age of an ammonite fossil? Why is carbon-14 a poor choice?
3. In a living organism, there is one carbon-14 atom in every 1 x 10^12 (one trillion) carbon-12 atoms. What is the carbon-14 : carbon-12 ratio for a fossil that was alive 2.5 x 10^4 years ago?
4. There are two mammoth fur specimens in the nature museum. The content of carbon-14 of fur sample A is currently 25% of that of fur sample B. Suppose the two samples are still in the museum 5730 years later, what is the ratio of carbon-14 content between the two samples?
5. You discover what appears to be an ancient campsite near Ottawa. The ash from a fire-pit is collected and analyzed. When the results come back, it is found that the ratio of C-14 remaining was 41% of a sample that was dated to be 6300 years old. How long ago did the discovered fire pit exist?
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