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Science Library Quiz

The Nucleus and Radioactivity

Instructions: answer the questions, check them carefully, and when you are sure they are all right, press submit. The number of correct answers will be displayed.

Question 1: Geologists use radioactive decay half-lives to measure the age of:




Question 2: Paleontologists use radioactive decay half-lives to measure the age of:




Question 3: Archaeologists use radioactive decay half-lives to measure the age of:




Question 4: How long will it take an 8-kg sample of uranium-235 to decay to 1 kg? (The half-life of U-235 is $7.0 x 10^8$ years).




Question 5: How long will it take an 8-kg sample of uranium-238 to decay to 1 kg? (The half-life of U-238 is $4.5 x 10^9$ years). Atomic decay




Question 6: Carbon-14 is ......... of carbon.







Question 7: $_6^14C$ is used for:




Question 8: Thorium-232 has a half-life of 14 billion years. If thorium-232 appeared in the universe soon after the Big Bang, how much would be left today?




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