Question

A spruce tree trunk has been found preserved in glacial till. Samples taken from the trunk have been found to contain approximately 12.5% of Carbon-14. How many half-lives have elapsed since this tree was buried?

Answer 1

three half-lives

Step-by-step explanation:

Converting 12.5% to decimal gives 0.125

If one half life is 0.5.

0.5*0.5*0.5 gives 0.125

Thus 3-half lives has been elapsed