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Math Help - Radioactive Decay

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    Radioactive Decay

    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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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by nystudent2729 View Post
    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: \text{half life } = \frac {\ln 2}c

    to see this, set q(t) = \frac 12 q_0 and solve for t
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