decay time

noun Physics.

the time required for a collection of atoms of a particular radionuclide to decay to a fraction of the initial number equal to 1/e. Compare e (symbol) (def. 1).

Also called mean life.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Decay time is always a great word to know.

So is electromagnetic wave. Does it mean:

the force that acts between bodies of like electric charge or magnetic polarity, tending to separate them

a wave produced by the acceleration of an electric charge and propagated by the periodic variation of intensities

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