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OpenStudy (anonymous):
A radioactive substance decays at a rate proportional to the amount present. If 30% of such a substance decays in 15 years, what is the half-life of the substance?
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OpenStudy (anonymous):
naw dude, you forget that the rate of decay is porportional to the time
OpenStudy (anonymous):
*amount present
OpenStudy (anonymous):
I got it nvm
OpenStudy (anonymous):
|dw:1345218321266:dw| so the half-life is 25 years...
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