Saturday, November 7, 2009

Half-Life wordproblem help?

I am trying to help my girl with her homework.the problem isat 0 hours drug is at 100%
at 36 hours drug is at 50% (half-life)
what is the percentage is the drug at in 24 hourshow would i answer this, im not just looking for answer but how
Answers:
you would havte to use the decay formula. Af=Ao * E^(-.693*t/t/2)
Af is final activity
Ao is initial activity
t is time (inthis case 24 hours)
t/2 is half life ( inthis case 36 hours)
E is antilog
-.693 is a mathmatical constant
answer is 63%
tell your girlfriend good luck with nursing 1
well to find 24 hours..i would divide the 36 by 3.that gives you 12..then multiply that by 2 giving you the 24 hoursdo the same for the 50%.divide it by 3.gives you 16.67 (rounded) then multiply that by 2.giving you 33.34%not sure if that is right but it sounds right to me. good luck.
50 X
---- = ------
36 2436X = 50 ( 24 )X = 33.33% of the drug is metabolized so.

100% - 33.33% = 66.67% is the answer

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