lifetime


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lifetime

1. 
a. the length of time a person or animal is alive
b. (as modifier): a lifetime supply
2. Physics the average time of existence of an unstable or reactive entity, such as a nucleus, excited state, elementary particle, etc.; mean life

Lifetime

 

in physics, the average duration τ of existence of (1) excited states of atoms and molecules, which end with the spontaneous transition of particles to a less excited or basic (unexcited) state; the lifetime is an important characteristic of the energy levels of particles (the lifetime on a level); (2) unstable (radioactive) atomic nuclei as well as elementary particles; their lifetime is linked with their half-life period T by the formula τ = T/In 2; and (3) quasiparticles (elementary excitations) in solids and in liquid helium, particularly electrons and holes in semiconductors.

lifetime

[′līf‚tīm]
(physics)
References in periodicals archive ?
So for lifetime partnerships, this is the next phase....
Following the pattern of Islamabad, the Sindh government has also introduced lifetime token tax on cars/jeeps having the engine capacity up to 1000cc effective from July 1.
Savers must be aged at least 18 years old but under 40 to open a Lifetime Isa.
"Things were swirling at a low-grade fever for many years," said Rob Sharenow, programming president for the A&E Networks, which owns Lifetime. "For a lot of people, this was the first time that the voices were aggregated.
The transaction for Lifetime Care is currently awaiting approval by the New York State Department of Health, which could take between six and nine months.
"Most persons with preclinical AD will not develop AD dementia during their lifetimes," the authors write.
After the closing, Lifetime will have an enhanced portfolio of products with #1 positions in key product areas, a diversified customer base with marquee partnerships and a robust product development team and pipeline.
Our goal is to minimize the number of images required to retrieve accurately the fluorescence lifetime, while providing optical sectioning.
"The main finding in this cohort of elderly subjects from the general population was the association between lifetime [suicide attempts] and lifetime headache," Dr.
(1) For mechanical components, fatigue tests under load with constant amplitude are aimed at obtaining lifetime distributions resulting from the randomness of material parameters.
For the Lifetime Learning Credit, the income limits are lower than for the AOTC: for single filers, the MAGI phaseout range is $55,000-$65,000; for joint filers, the range is $110,000-$130,000 of MAGI.