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Math Help - A synthetic radioactive element decays at a rate proportional to its mass ....

  1. #1
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    Cool A synthetic radioactive element decays at a rate proportional to its mass ....

    A synthetic radioactive element decays at a rate proportional to its mass.
    (a) write down a differential equation to represent this situation.
    (b) If 30% of the element has decayed after 24 hours, what percentage is left after 48 hours?
    c) How long does it take for 90% of the element to decay?
    Last edited by mr fantastic; September 3rd 2011 at 01:27 AM. Reason: Re-titled.
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    Re: Help me with this qeustion, please

    One for free:

    Mass as a function of time: m(t)

    Decay Rate of Element: dm/dt

    Go!
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  3. #3
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    Re: Help me with this qeustion, please

    Quote Originally Posted by TKHunny View Post
    One for free:

    Mass as a function of time: m(t)

    Decay Rate of Element: dm/dt

    Go!
    And because I'm so nice, one for free from me too :P

    If a is proportional to b, then a = kb, where k is some constant.
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