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Math Help - Half life

  1. #1
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    Half life

    At the beginning of an experiment, a scientist has 100 grams of radioactive goo. After 225 minutes, her sample has decayed to 12.5 grams.

    1. What is the half-life of the goo in minutes?

    2. Find a formula for G(t), the amount of goo remaining at time t. G(t) =

    3. How many grams of goo will remain after 41 minutes?


    I got 1. It is 75 minutes

    how do you find a formula???
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  2. #2
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    Re: Half life

    G(t) = G_0 \left(\frac{1}{2}\right)^\frac{t}{h}

    G_0 = amount at time t = 0

    h = half-life
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  3. #3
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    Re: Half life

    so that is the formula for number 2?
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  4. #4
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    Re: Half life

    100(1/2)^(t/75)

    that's the forumla.
    now i just plug in 41 minutes for t.
    Last edited by habibixox; October 2nd 2011 at 01:23 PM.
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