October 9, 2015

Homework Help: MATH help

Posted by HM on Monday, September 26, 2011 at 1:19pm.

a certain radioactive isotope has a half life of approx 1,300 years .
How many years to the nearest year would be required for a given amount of this isotope to decay to 55% of that amount.

So I am not sure where to put the 1,300


or A=x*e^1300

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