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January 28, 2015

January 28, 2015

Posted by **Clarissa** on Thursday, September 17, 2009 at 7:42pm.

- physical science -
**DrBob222**, Thursday, September 17, 2009 at 7:49pmk = 0.693/t

_{1/2}

Then substitute k into the equation below.

ln(No/N) = kt

No = 24

N = solve for this

k from top equation

t = 15,000

Post your work if you get stuck.

Of course the much easier way is to say you go through three half lives so you are left with 1/8 of 24 = 3 grams.

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