A bone is found in which the amount of active carbon-14 is 1/8th the amount of a fresh sample..?

Question

If the half-life of carbon-14 is 5700 yrs, the age of the bone is approximately..

A. 5700 yrs

B. 11,400 yrs

C. 17,100 yrs

D. 22,800 yrs

Answer 1

C.

Answer 2

3 half-lives have elapsed.

(In reality, bones found in the field can be dodgy things to date in some circumstances.  They can get naturally contaminated.)