Carbon dating exponential decay
Most of the radioactive isotopes used for radioactive dating of rock samples have too many neutrons in the nucleus to be stable.Recall that an isotope is a particular form of an element.
When an organism dies, the amount of 12C present remains unchanged, but the 14C decays at a rate proportional to the amount present with a half-life of approximately 5700 years.If you're behind a web filter, please make sure that the domains *.and *.are unblocked. However, I note that there is no beginning or ending amount given.Or you can tell that certain parts of the Moon's surface are older than other parts by counting the number of craters per unit area.The old surface will have many craters per area because it has been exposed to space for a long time. If you assume that the impact rate has been constant for the past several billion years, then the number of craters will be proportional to how long the surface is exposed.
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Libby invented carbon dating for which he received the Nobel Prize in chemistry in 1960.