Exponential decay
From Conservapedia
This is an old revision of this page, as edited by DavidE (Talk | contribs) at 15:11, December 14, 2009. It may differ significantly from current revision.
Exponential decay is the decay of a physical property whose value goes as
where 
is the value at time 
and 
expresses the rate of exponential decay. The quantity reaches one-half of its original value after a time interval equal to ln 2, which is called its half-life.
