logarthems

maggie

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Oct 2, 2011
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what is the logarithm used to solve: The half-life of a radioactive substance is one hundred ninety-four days. How many days will it take for eighty percent of the substance to decay?
 
You have nothing?

Not even \(\displaystyle P_{0}\) = Initial Population

P(t) is the population at time 't'.

\(\displaystyle P(t) = P_{0}\cdot e^{-a\cdot t}\)

Use the given information (half-life) to fine 'a'.

Let's see what you get.
 
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