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# I know the half life but how do i find k?

My equation is N(t)=20000e^(k*10.5) how do i find k?

### 1 Answer

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- flyingtiggerukLv 78 years agoBest Answer
Is 10.5 the half life?

For any half life the ratio of activity is 0.5

0.5 = e^(10.5k)

ln(0.5) = 10.5k

k=ln(0.5)/10.5

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