Differentiate carbon dating uranium dating
As fewer parent atoms are left, fewer decays occur.
If it takes a certain length of time for half of the parent atoms of a radioactive isotope to decay (half-life), it will take the same amount of time for half of the remaining parent atoms (a fourth of the original total) to decay.
All radiometric dating is based on this very simple equation and the exponentially decreasing curve.
In other words, N is the present abundance of parent atoms, the original abundance of parent atoms equals N, t is time, and k is a constant related to the half-life (the time it takes for half of the parent atoms of a radioactive isotope to decay).
Radiometric dating also tells how much time has passed since a particular event took place.