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anonymous
 5 years ago
In 5 days a 10.0mg sample of radioactive material decays to 3.5mg. based on this information what is the half life?
anonymous
 5 years ago
In 5 days a 10.0mg sample of radioactive material decays to 3.5mg. based on this information what is the half life?

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shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.0Hm. Do you have an exponential decay function to work with?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Current quantity = original quantity times e raised to the power (elaspsed time / half life), if I remember correctly, or \[Q=Q _{0}e ^{t/h}\]. Plug in and solve for half life; you have everything else you need.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Oops. I think my exponent is missing a k, specifically ln(2). So the correct exponent, if I'm right, is e^(t ln2)/h
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