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Jenny12
 5 years ago
Iodine131 has a half life of about 8 days. About how much is left from a 100 gram sample after 16 days?
Jenny12
 5 years ago
Iodine131 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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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[x/100 = (1/2)^{16/8}\] x/100 = (1/2)^2 x/100 = 1/4 x = 25

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0There are 2 halflives involved here. The first half life will cut the sample down to 50g. The second half life will cut it down to 25 grams. It is half of what was left at each halflife period. Hope this helps. I had to do one of these equations in my Calc 3 class.

Jenny12
 5 years ago
Best ResponseYou've already chosen the best response.0So would that be 25 left?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes. If you had a 24 minute period, then you would have 12.5g left, and so on.
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