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## Homework Statement

A tree contains a known percentage p0 of a radioactive substance with half-life tau. When the tree dies the substance decays and isn't replaced. If the percentage of the substance in the fossilized remains of such a tree is found to be p1, how long has the tree been dead?

## Homework Equations

I don't know what formula to use but I know that I have to solve for t in the formula. So I just need to know the formula.

## The Attempt at a Solution

p1=(1/2)^(-t/tau)

This is all I can come up at this moment. I don't know if this is the right formula.