1. The problem statement, all variables and given/known data The carbon in living matter contains fixed proportion of the radioactive isotope carbon-14. The carbon-14 in 1.00g of living matter has an activity of 0.250Bq. The half life of carbon-14 is 5730 years. (a) Calculate (i) The decay constant in s-1 (ii) the number of carbon-14 atoms required to produce an activity of 0.250Bq. (b) When a plant dies the proportion of carbon-14 decreases due to radioactive decay. A 1.00g sample of carbon from an ancient boat has an activity of 0.0625Bq. Determine the age of the boat. 2. Relevant equations A = yN A = A0e-yt A0 = yN0 A = A0e-yt 3. The attempt at a solution I've worked out (a) (i) to be 2.48x10-12 and (ii) N = 1.01x1011 I don't know how to work out (iii) because I don't know how to work out N0 or A0. I found using A = yN --> N = A/y = 2.52x1010 How to find either A0 or N0 so that I can use A = A0e-yt or N = N = N0e-yt?