SOLUTION: A substance decays exponentially. If the 80 ounces of the substance decays to 9 ounces in 3 hours. What is the half - life of the substance?
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Question 892641: A substance decays exponentially. If the 80 ounces of the substance decays to 9 ounces in 3 hours. What is the half - life of the substance?
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
, generalized exponential decay equation
p, how much present at time t starting from initial amount I
I, initial amount when t=0
t, time
k, a constant
e, the Euler number, base of Natural logarithm
First, find k using I=80, p=9, t=3.
For the value of k:
, using k as a positive value.
Half-Life
Here, .
in hours.
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