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exponential decay

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exponential decay [‚ek·spə′n en·chəl di′kā]
(physics)
The decrease of some physical quantity according to the exponential lawN(t)=N0e-t, where τ is a constant called the decay time.


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The rate of elimination fit best to a two-phase exponential decay with a biologic half-life of 12 and 266 hr.
When a quantity decreases by a fixed fraction--here 1/2--it's known as exponential decay.
If, for example, one combines the last known term with half the previous term, adding or subtracting according to the toss of a coin, the sequence's numbers decrease at a certain rate, displaying exponential decay.
 
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