Exponential decay

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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.


Examples of exponential decay include the radioactive decay of radioisotopes, the attenuation of sound or light through an absorber, and the decay of the magnetic fields of the planets.[1]

See also


  1. The Creation of Planetary Magnetic Fields, by Russell Humphreys, Creation Research Society Quarterly, December 1984