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26 April, 03:53

The half-life of iodine-131 is 8.10 days. how long will it take for three-fourths of a sample of iodine-131 to decay?

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  1. 26 April, 04:22
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    You really should have a mass given but since you dont just choose a simple one like 40

    three fourths of forty is 30

    how long will it take for iodine-131 to decay from 40-30

    it would take 8.1 days for it to decay from 40-20

    so it would take half that time for it to decay till 30

    so 8.1/2

    it would take 4.05 days

    (this will work with any amount)
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