Half life from graphs
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This document provides questions about half-life calculations for plutonium-239 and carbon-14 isotopes. It asks what percentage of plutonium is left after 56,000 years, which isotope has a shorter half-life between C-14 and Pu-239, the half-life of Pu-239, the approximate half-life of C-14, how long it takes for C-14 activity to drop to one quarter its initial value, and how long it takes for Pu-239 activity to drop to one eighth its initial value. The answers to the questions are provided at the end.
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Half life from graphs
- 1. Half life from Graphs Answer these questions on paper . The answers are at the end. Do not look at the answers until you have completed all the questions.
- 2. 1. What percentage of Plutonium is left after 56,000 years?
- 3. 2. Which isotope has the shortest half life C-14 or Pu-239?
- 4. 3. What is the half life of Pu-239?
- 5. 4. What is the approximate half life of C-14?
- 6. 5. How long does it take for the activity of the C-14 sample to fall to one quarter of its initial value?
- 7. 6. How long does it take for the activity of the Pu-239 sample to fall to one eighth of its initial value?
- 8. Answers 1. 20% (1 mark for 20 and 1 mark for %) 2. Carbon 14 or C-14 (1 mark) 3. 24,000 years (1mark for 24, 1 for thousand, and 1 mark for years) 4. 5600 years (1m for between 5000 and 6000 and 1m for years) 5. 12,000 years (1 mark for 9,000 – 12,000 and 1 mark for years) 72,000 years (1 mark for 3x the answer to questions 3 and 1 mark for years) Total = 12 marks