Radiometric dating youtube
Atomic nuclei of a radioactive element decay spontaneously, producing other elements and isotopes until a stable species is formed.
The life span of a single atom may have any value, but a statistical quantity, the half-life of a macroscopic sample, can be measured; this is the time in which one-half of the sample disintegrates.
When the organism dies, it stops exchanging carbon with the atmosphere, and the ratio of carbon-14 to carbon-12 begins to decrease with the half-life of 5,730 years.
Measurement of this ratio determines the age of the specimen.
Numerous fossils have been found in strata inconsistent with the evolutionary model of Earth's history.The proportion of argon to radioactive potassium in the sample today is observable, and the decay constant of potassium is readily calculable by measuring the amount of argon produced from the decay of K after a specified time.