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Half Life Practice Problems

Quiz by Wanda Rice

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5 questions
Show answers
  • Q1
    What is the half-life of a 50 g sample of nitrogen-16 that decays to 6.25 g in 21.6 seconds?
    64.8 seconds
    21.6 seconds
    3 seconds
    7. 2 seconds
    30s
  • Q2
    If a 200 g sample of technetium-99 decays to 12.5 g in 852,000 years, what is its half-life?
    852,000 years
    3,408,000 years
    213,000 years
    4 years
    30s
  • Q3
    A 50 g sample of iodine-131 sample decays to 6.25 g, how many half-lives have passed?
    3
    2
    1
    4
    30s
  • Q4
    What percent of hafnium-156 remains undecayed , if a 50 g sample decays to 6.25 g?
    25%
    50%
    87.5%
    12.5%
    30s
  • Q5
    Chromium-48 has a half-life of 21.6 hours, how much of the sample has decayed after 108 hours if the beginning mass was 360 g?
    15/16
    .125
    1/8
    1/16
    30s

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