All living cells have approximately the same 14C to 12C ratio as found in CO, in the atmosphere. When an animal or plant or bacterial cell dies, it begins to lose 14C by radioac tive decay; thus, over time the 14C to 12C ratio decreases. This ratio can be measured by a mass spectrometer. As a novice archaeologist, you find an old piece of wood and have it analyzed for 14C/12C. The ratio found is 28% of the present ratio. How long ago was the wood formed?
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