ESS- Half-Life Practice
Show all work while completing the questions below. I will give points for the work and the answers.
This assignment should fill BOTH sides of a sheet of paper!
1. If you have 100 grams of C-14 and the half-life is 5700 years, answer the following questions.
a. Mass of C-14 after 5700 years.
b. Mass of C-14 after 11,400 years.
c. Mass of C-14 after 17,100 years.
d. Estimate the mass of C-14 after 8,000 years.
(Hint: Make a graph. I will give points for the graph and your answer.)
2. If you have 500 grams of K-40 and the half-life is 1.3 billion years, answer the following questions.
a. Mass of K-40 after 1.3 billion years.
b. Mass of K-40 after 2.6 billion years.
c. Mass of K-40 after 3.9 billion years.
d. Estimate the mass of K-40 after 1.0 billion years.
(Hint: Make a graph. I will give points for the graph, work and your answer.).
3.
If you have 28 grams of C-14 after 22,800 years, how many grams of C-14 did you start with?
4. Dating with radioisotopes has a high degree of accuracy, but radioisotope dating may not work so well
in the future. Explain why using COMPLETE SENTENCES.