1. Which isotope would be most useful in dating a wooden bow suspected to be used by a member of the Sioux tribe prior to colonization of America by Europeans? What is your reasoning for this answer?
2. How old is a sample that contains 25% of its original K-40?
3. It the original sample was 100g, how long would it take a sample of U-238 to decay to 50% of its original amount?
