Posted by Judy on Saturday, November 17, 2007 at 12:41pm.
A half-life is how long it takes for a radioactive isotope to decay by half.
At 2 PM, you will have .5 grams of the material.
Each hour thereafter, divide the material by half to see how much remains.
A better way is with the exponential function on your calculator.
Amountremaining= Originalamount* e^(-.692t/halflife)
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