A radioactive substance decays according to the law q(t)=q(sub0)e^(-ct), where q(sub0)=q(0). Find its half life if c=1000. Thanks for the help.
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Originally Posted by nystudent2729 A radioactive substance decays according to the law q(t)=q(sub0)e^(-ct), where q(sub0)=q(0). Find its half life if c=1000. Thanks for the help. there's a formula for this: $\displaystyle \text{half life } = \frac {\ln 2}c$ to see this, set $\displaystyle q(t) = \frac 12 q_0$ and solve for t
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