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Half-Life

Quiz by Hannah Keener

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5 questions
Show answers
  • Q1
    The half-life of Selenium-83 is 25 minutes. How long does it take for a 100mg sample to decay to 12.5mg?
    25 minutes
    100 minutes
    0 minutes
    75 minutes
    120s
  • Q2
    The half-life of Po-218 is 3 minutes. How much of a 2.0 gram sample remains after 12 minutes?
    0.125
    2
    .5
    .0625
    120s
  • Q3
    The half-life of an isotope is 2 years. How many years would it take for a 4 mg sample of the isotope to decay and have only 0.50 mg of it remain?
    2 years
    5 years
    10 years
    6 years
    120s
  • Q4
    Actinium-226 has a half-life of 29 hours. If 100 mg of actinium-226 disintegrates over a period of 58 hours, what fraction of the original actinium-226 will remain?
    1/8
    1/4
    1/2
    2
    120s
  • Q5
    The half-life of iodine-125 is 60 days. How many half-lives will have occurred after 360 days?
    2
    10
    6
    36
    120s

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