Question

An artifact contains one-fourth as much carbon-14 as the atmosphere. How old is the artifact? Use figure 10-3 to answer this question

Answer 1

Figure out how many half-lives have passed once a sample as decayed to 1/4 of the original.

Multiply the number of half-lives by the half-life of carbon given in the chart.

Answer 2

After one half-life there is 1/2 or 50 % amount compared to amount of C-14 in atmosphere.