A human piece of pottery is dated at 42,250 years old by using…

A human piece of pottery is dated at 42,250 years old by using…

A human piece of pottery is dated at 42,250 years old by using carbon-14. How many half lives have passed since the pottery was made?

2.) What would the percentage of thorium- 232 (parent compound) be in a rock that was dated at 2.8 billion years?

3.) The concentration of the radioactive isotope potassium-40 in a rock sample is found to be 6.25%. What is the age of the rock?

4.) A rock found to contain 2.2 grams of uranium-232, a radioactive isotope. If the rock has undergone 2.75 half lives, what was the original amount of uranium-235 in the rock and how old is the rock?

5.) An igneous rock originally has 4 gram of uranium-238 in it. When dated, the rock only contains 2.4 grams. What are the parent and daughter concentrations (in percentages) and what is its age?