en.wikipedia.org/wiki/Half-life

... of the following three equivalent formulas: ... is the half-life of the decaying quantity, ...

www.coolmath.com/algebra/17-exponentials-logarithms/13-radioactive-decay-decibel-levels-01

... introduces radioactive decay and decibel levels and explains how to use their formulas. ... "Half-life means that, if you have 100 pounds of Plutonium-239.

www.calculator.net/half-life-calculator.html

Free online tool to calculate any one of the values from the other three in a half- life formula as well as to convert between half life, mean lifetime, and decay ...

hyperphysics.phy-astr.gsu.edu/hbase/Nuclear/halfli2.html

The radioactive half-life for a given radioisotope is a measure of the tendency of the nucleus to "decay" or ... so the standard form of the decay equation is: ...

www.softschools.com/formulas/chemistry/radioactive_halflife_formula/113

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay. For example, if the half-life of a 50.0 gram sample is 3 years, ...

chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Kinetics/Reaction_Rates/Half-lives_and_Pharmacokinetics

Jun 11, 2017 ... In order to find the half life we need to isolate t on its own, and divide it by 2. We would end up with a formula as such depict how long it takes ...

www.khanacademy.org/science/physics/quantum-physics/nucleus-physics/v/introduction-to-exponential-decay

Using the exponential decay formula to calculate k, calculating the mass of carbon-14 ... There's some unstable atoms that have a very short half-life (in terms of ...

www.chem.purdue.edu/gchelp/howtosolveit/Kinetics/Halflife.html

Equations for half lives; Determining a half life; Converting a half life to a rate ... Substitute this information into the equation for the half life of a reaction with this ...