Definition, half-life is the period of time it takes for a substance undergoing decay to decrease by half.

The calculation of half-life used in this tool is based on the exponential decay equation.

This calculation is designed for exploration.

Alternatively, this information can be expressed in terms of the decay constant.The order of the reaction or game nguoi sat cho di dong enough information to determine.For a zero order reaction.If the radioactive half-life of an isotope.The halflife of carbon 14 is years, and the method of dating lies in trying to determine how much carbon 14 (the radioactive isotope of carbon) is present in the artifact and comparing it to levels currently present in the atmosphere.Equations for Half Lives, for a zero order reaction.The Half Life Time is the amount of time it takes for half of the atoms in a sample to decay.An exponential decay process can be described by the following formula: where: N(t) the quantity that still remains and has not yet decayed after a time.Scientists use C-14 in a process called carbon dating.

Half-life Calculation Formula in Exponential Decay.

The calculation below is stated in terms of the amount of the substance remaining, but can be applied to intensity of radiation or any other property proportional.In some cases, we need to know the initial concentration,.Carbon dating has given archeologists a more accurate method by which they can determine the age of ancient artifacts.The Half Life of Uranium-238 is 4,500,000,000 years.AmtE Ending Amount, click on Calculate Time or Calculate Half-time or Calculate Beginning Amount or Calculate Ending Amount you wish to calculate.Top, graphical Relations and Half Lives, if we plot the concentration of a reactant versus time, we can see the differences in half lives for reactions of different orders in the graphs.