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Symbolically, the process of radioactive decay can be expressed by the following differential equation, where N is the quantity of decaying nuclei and k is a positive number called the exponential decay constant.
The meaning of this equation is that the rate of change of the number of nuclei over time is proportional only to the number of nuclei.
Its crust is continually being created, modified, and destroyed.
As a result, rocks that record its earliest history have not been found and probably no longer exist.
After the passage of two half-lives only 0.25 gram will remain, and after 3 half lives only 0.125 will remain etc.Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.