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examples, with citation for one of them
where <math>A_0</math> is the value at time <math>t_0</math> and <math>\tau</math> expresses the rate of exponential decay. The quantity reaches one-half of its original value after a time interval equal to <math>\tau</math> ln 2, which is called its [[half-life]].
where <math>A_0</math> is the value at time <math>t_0</math> and <math>\tau</math> expresses the rate of exponential decay. The quantity reaches one-half of its original value after a time interval equal to <math>\tau</math> ln 2, which is called its [[half-life]].
==Examples==
Examples of exponential decay include the [[radioactive decay]] of [[radioisotope]]s, the [[attenuation]] of [[sound]] or [[light]] through an [[absorber]], and the decay of the [[magnetic field]]s of the [[planet]]s.<ref>[http://www.creationresearch.org/crsq/articles/21/21_3/21_3.html The Creation of Planetary Magnetic Fields], by [[Russell Humphreys]], ''[[Creation Research Society Quarterly]],'' December 1984</ref>
==See also==
==See also==
*[[Exponential growth]]
*[[Exponential growth]]
==References==
<references/>
[[Category:Physics]]
[[Category:Physics]]