12 3 dating with radioactivity
And because of that now we can't trust Scientific datings of the earth, universe, rocks, etc.because "god" or events like the biblical flood could have made the earth seem older.Thereafter, the concentration (fraction) of 14C declines at a fixed exponential rate due to the radioactive decay of 14C. ) Comparing the remaining 14C fraction of a sample to that expected from atmospheric 14C allows us to estimate the age of the sample.
Note that the position the "God made the Earth seem older." (also known as the Omphalos hypothesis) is unfalsifiable.
The half-life of a first-order reaction under a given set of reaction conditions is a constant.
This is not true for zeroth- and second-order reactions.
There are also trace amounts of the unstable radioisotope carbon-14 (14C) on Earth.
Carbon-14 has a relatively short half-life of 5,730 years, meaning that the fraction of carbon-14 in a sample is halved over the course of 5,730 years due to radioactive decay to nitrogen-14.