An archaeologist finds some ancient jewelry made from bone. the jewelry has a carbon mass of 127 g (hint: assume all the carbon is 12c and determine the number of atoms) and careful measurements show that the remaining 14c has a current decay rate of 21 decays/s. determine the age of the bone (and presumably the jewelry). remember, the ratio of 14c to 12c when the animal died was 1.3×10-12 & the half-life of 14c is 5730 y.