1. The problem statement, all variables and given/known data The activity of carbon, due to the decay of C14, is 16 disintegrations per minute per gram of carbon. The atomic weight of naturally occurring carbon is 12 u. What is the ration of C14 to C12 in the CO2 of the atmosphere? The half life of C14 is 5730 years. 2. Relevant equations t(half life) = ln(2)/ lambda N = N(initial) e^ (-lambda * t) R = -dN/dt 3. The attempt at a solution I just don't know how to attempt this problem without having a time frame. I don't expect the answer, but if there is an equation I missed that is helpful, or something I seem to not understand, I would greatly appreciate being told! Thanks!