February 22, 2017

Homework Help: Pre Calc

Posted by Alex on Thursday, January 13, 2011 at 11:22pm.

The half-Life of radioactive earthium is 2651 years. Find how many years it will take 100 grams of earthium to decay to 10 grams.

I know the equation is A=Ae^(-rt)

I tried working it out but I think I am doing it wrong.
I did 10=100e^(-r*2651)

Can anyone help? Thanks a lot

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