An Exponentially Decaying Substance Was Weighed Every Hour and the Results

question 76

Short Answer

An exponentially decaying substance was weighed every hour and the results are given below.What is the approximate half-life, in hours, of the substance? Round to 1 decimal place.
$\begin{array}{cc}\text { Time } & \text { Weight (in grams } \\9 \mathrm{am} & 16 \\10 \mathrm{am} & 14.623 \\11 \mathrm{am} & 13.364 \\12 \text { noon } & 12.214 \\1 \mathrm{pm} & 11.163\end{array}$

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