<PRE><B>Question 694031</B>
Artifact is discovered at a certain site. If it has 79% of the carbon-14 it originally contained, what is the approximate age of the artifact? (Carbon decays at the rate of 0.0125% annually)
-----------------------------------
Note: 1 - 0.000125 = 0.999875
------
0.79*Ao = Ao(0.999875)^t
---------
0.999875)^t = 0.79
---
Take the log:
---
t = ln(0.79)/ln(0.999875) = 1886 yrs old
============================================
cheers,
Stan H.
=========================</PRE>