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- 1. Multiple ChoiceWhat is Half-life?The amount of time it takes for some of the nuclei in a sample of the isotope to decayThe amount of time it takes for half the electrons in a sample of the isotope to decayThe amount of time it takes for half the nuclei in a sample of the isotope to decaythe amount of time it takes to double the nuclei in a sample of the isotope to decay
- 2. 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
- 3. Multiple ChoiceAfter the third half-life, how much of the sample is left?1/21/31/161/8
- 4. Multiple ChoiceThe half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?1/21/641/51/32
- 5. 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
- 6. 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
- 7. Multiple ChoiceGamma rays damage human cells/tissue.TrueFalse
- 8. Multiple ChoiceWhen nuclei decay, massive amounts of __________ is released.energyjelloprotonsneutrons
- 9. Multiple ChoiceWhen an element loses protons, its __________changes.protonic numberelectronic numberneutronic numberatomic number
- 10. Multiple ChoiceWhat makes an element radioactive?When it's nuclei expandsWhen it's electrons explodeWhen it's nuclei behaveWhen it's nuclei decay
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