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Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon.

At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.

Given: isotope and final activity Asked for: elapsed time Strategy: A Use Equation 14.5.5 to calculate and the rate constant, solve Equation 14.5.7 to obtain the elapsed time.

Solution: We know the initial activity from the isotope’s identity (15 dpm/g), the final activity (8.0 dpm/g), and the half-life, so we can use the integrated rate law for a first-order nuclear reaction (Equation 14.5.7) to calculate the elapsed time (the amount of time elapsed since the wood for the tools was cut and began to decay).

Where t is the age of the fossil (or the date of death) and ln() is the natural logarithm function.

If the fossil has 35% of its carbon 14 still, then we can substitute values into our equation.

This is not true for zeroth- and second-order reactions.

Analysis of a sample of charcoal from a fire in one such site gave a The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value.principle sources: Australian Museum https://au/the-geological-time-scale Wikipedia Carleton University numerical (or "absolute") age is a specific number of years, like 150 million years ago.The rate of radioactive decay is an intrinsic property of each radioactive isotope that is independent of the chemical and physical form of the radioactive isotope.In this section, we will describe radioactive decay rates and how half-lives can be used to monitor radioactive decay processes.Radiocarbon dating can be used on samples of bone, cloth, wood and plant fibers.The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay.When an organism dies it ceases to replenish carbon in its tissues and the decay of carbon 14 to nitrogen 14 changes the ratio of carbon 12 to carbon 14.

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