9) Living tissue normally contains 4.0 mg of C-14 per gram of tissue. If you dig up a skeleton
and find that the skeleton has 0.25 mg of C-14 per gram left, about how old is the sample?
(C-14 half-life = 5730 years)
a) 5730 yrs
b) 11460 yrs
17190 yrs
d) 22900 yrs