Name ____________________________________________________
Period _______
Code # _________
CHAPTER 5 - INTERPRETING EARTH'S HISTORY PAGES 115 - 140
54.
Define absolute age.
55.
Define isotopes.
56. Why is an isotope considered radioactive?
57.
Define decay product.
58. Even though atoms decay at random and we cannot predict when a single atom will decay. What can be predicted?
59.
Define half-life.
60.
Does quantity of matter affect the half-life?
61.
Define decay-product ratio.
62.
How many half-lives has a sample gone through if you have equal amounts (50%) of radioactive material and decay
product?
63.
How many half-lives has a sample gone through if you have one-quarter (25%) radioactive material and three-quarter
(75%) decay product?
64.
How many half-lives has a sample gone through if you have one-eight (12.5%) radioactive material and three-eights
(87.5 %) decay product?
65. Will environment conditions such as temperature, pressure or chemical combinations affect the half-life of any
radioactive sample?