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This is used to modelize waiting times, at telephone booths,
at postoffices and in science for time until decay of an atom in
Call T the time to decay for an atom,
The physicists do not use this parametrization, they use the notion of
half life h, this is the median of the exponential:
Strontium 90 is a dangerous component of nuclear fallout.
It has a half life of 28 years.
How long does it take for
of the strontium to disappear?
Physics and Exponential Decay