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March 31, 2015

March 31, 2015

Posted by **Lily** on Thursday, December 19, 2013 at 9:59pm.

- Science -
**DrBob222**, Thursday, December 19, 2013 at 11:01pmk = 0.693/t

_{1/2}

Substitute t_{1/2}and solve for k, then substiute into the equation below.

ln(No/N) = kt

No = 3

N = ?

k from above.

t = 120

Substitute and solve for N = tonnes remaining after 120 years

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