Iodine 131 is a radioactive isotope. After 4.00 days, 70.8% of a sample of 131I remains.What is the half life of 131I?

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  1. .708=(0.5)^(4.00/half life)

    Take log on both sides and rearrange equation to solve for half life.

    -.150=(4.00/half life)*-.301
    (4.00/half life)=.498
    half life = 8.03 min

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  2. I might believe 8 days but not 8 min.

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