Thursday

July 31, 2014

July 31, 2014

Posted by **soojung** on Friday, February 16, 2007 at 3:56pm.

Calculate how long it take for the decay rate to decrease to 60% of the initial value, when the half life is that of C-14, which is 5568 years. They expect you to look that up, or know it.

Let t = the age in years

2^(-t/5568) = 0.6

Solve for t.

(-t/5568)*log 2 = log 0.6

-t/5568 = log .6/log2 = -.737

t = 4100 years

- physics -
**Anonymous**, Saturday, March 27, 2010 at 9:24pmHalf life of C-14 is 5730 yrs. Which would give you 4.22x10^3 yrs as your answer.

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