Editing Half-life (section)

===Examples===
{{Further|Exponential decay#Applications and examples}}
There is a half-life describing any exponential-decay process. For example:
*As noted above, in [[radioactive decay]] the half-life is the length of time after which there is a 50% chance that an atom will have undergone [[atomic nucleus|nuclear]] decay. It varies depending on the atom type and [[isotope]], and is usually determined experimentally. See [[List of nuclides]].
*The current flowing through an [[RC circuit]] or [[RL circuit]] decays with a half-life of {{math|ln(2)''RC''}} or {{math|ln(2)''L''/''R''}}, respectively. For this example the term [[half time (physics)|half time]] tends to be used rather than "half-life", but they mean the same thing.
*In a [[chemical reaction]], the half-life of a species is the time it takes for the concentration of that substance to fall to half of its initial value. In a first-order reaction the half-life of the reactant is {{math|ln(2)/''λ''}}, where {{mvar|λ}} (also denoted as {{mvar|k}}) is the [[reaction rate constant]].