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The half-life of lead is 18 years. How long will it take for the sample of this substance to decay to 15%?a. Find your k

The half-life of lead is 18 years. How long will it take for the sample of this substance to decay to 15%?a. Find your k
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4 votes
The half-life of lead is 18 years. How long will it take for the sample of this substance to decay to 15%?a. Find your k

asked
User Ahmad Nawaz
by
7.6k points

1 Answer

2 votes

Solution

We are given

Half Life = 18 years

To solve for k


\begin{gathered} 0.5=e^(-18k) \\ ln(0.5)=-18k \\ k=-(ln(0.5))/(18) \\ k=0.0385081767 \end{gathered}

answered
User Hasnat
by
8.4k points
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