How old is an artifact that contains 12.5 percent of its original carbon-14? : The generally accepted value for the half-life of Carbon-14 is 5730 yr : Let t = time for 12.5% of the artifact to remain Let the initial amt = 1
: 1*2^(-t/5730) = .125 use nat logs ln(2) = ln(.125) = = -3 t = -3 * -5730 t = 17,190 yrs
