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Half life practice problems

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  • 1. Multiple Choice
    30 seconds
    1 pt
    What is Half-life?
    The amount of time it takes for some of the nuclei in a sample of the isotope to decay
    The amount of time it takes for half the electrons in a sample of the isotope to decay
    The amount of time it takes for half the nuclei in a sample of the isotope to decay
    the amount of time it takes to double the nuclei in a sample of the isotope to decay
  • 2. Multiple Choice
    1 minute
    1 pt
    The 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?
    100.0g
    50.0g
    12.5g
    8.5g
  • 3. Multiple Choice
    2 minutes
    1 pt
    After the third half-life, how much of the sample is left?
    1/2
    1/3
    1/16
    1/8
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