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Jenny12

  • 5 years ago

Iodine-131 has a half life of about 8 days. About how much is left from a 100 gram sample after 16 days?

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  1. anonymous
    • 5 years ago
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    25 grams. When dealing with half lifes use the formula \[y = Ce ^{t/h}\] C is the starting amount, in this case 100 grams, h is half life time or 8 days and t is the amount of time passed or 16 days. so plugging everything in we get \[y=100*(1/2)^{16/8} = 100*(1/2)^2 = 100*1/4\] = 25 grams

  2. anonymous
    • 5 years ago
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    i ment to say \[y = C(1/2)^{t/h}\]

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