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December 20, 2014

December 20, 2014

Posted by **Judy** on Saturday, November 17, 2007 at 12:41pm.

- Physics -
**Michael**, Saturday, November 17, 2007 at 1:09pmA 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.

- Physics -
**bobpursley**, Saturday, November 17, 2007 at 3:02pmA better way is with the exponential function on your calculator.

Amountremaining= Originalamount* e^(-.692t/halflife)

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