Half-life is constant over the lifetime of an exponentially decaying quantity, and it is a characteristic unit for the exponential decay equation.The accompanying table shows the reduction of a quantity as a function of the number of half-lives elapsed.In short, the half life tells us the scale of the graph.
) is the time required for a quantity to reduce to half its initial value.
Note the consequence of the law of large numbers: with more atoms, the overall decay is more regular and more predictable.
C) dating usually want to know about the radiometric dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years.
It makes no sense at all if man appeared at the end of billions of years.
We will deal with carbon dating first and then with the other dating methods.