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- 1. Multiple ChoiceThe rate at which a radioactive element decays is its ____.quarter lifewhole lifewonderful lifehalf life
- 2. Multiple Choice
what's the half life of this substance?1 day2 days3 days4 days - 3. Multiple ChoiceThe half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?100.0g50.0g12.5g8.5g
- 4. Multiple ChoiceBarium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?0.25g2.5g25g80g
- 5. Multiple ChoiceThe half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?3.0g0.25mg0.3g0.25g
- 6. Multiple ChoiceIf the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?200yrs100yrs50yrs300yrs
- 7. Multiple ChoiceWhat is a half-life?The average time it takes for any element to disappear completelyThe time it takes for a radioactive atom to lose half its neutronsThe time it takes for half of any number of radioactive atoms to decayThe time it takes for a radioactive atom to lose half its electrons
- 8. Multiple ChoiceImagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left after 4.5 billion years?25,00050,00012,5000
- 9. Multiple ChoiceIf 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.1.25mg1.25g10g10mg
- 10. Multiple ChoiceIf the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?1 half-life2 half-lives3 half-lives4 half-lives
- 11. Multiple ChoiceThe half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?100.0g50.0g12.5g8.5g
- 12. Multiple ChoiceThe half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?3.0g0.25mg0.3g0.25g
- 13. Multiple ChoiceIf the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?1 half-life2 half-lives3 half-lives4 half-lives
- 14. Multiple ChoiceWhat is the half-life of iodine-131?32 days8 days16 days24 days
- 15. Multiple ChoiceThe half life of an element is 20 minutes. What % of the element remains after an hour?0%12.5%20%25%
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