1. The average time taken to achieve this is the mean lifetime . 2. The mean lifetime of your batteries is a fixed number. 3. In a radioactive decay process, this time constant is also the mean lifetime for decaying atoms. 4. At the equator it has a mean lifetime of 300 years-but lasts longer if buried. 5. In fact, a free neutron decays this way, with a mean lifetime of about 15 minutes. 6. Any one of decay constant, mean lifetime , or half-life is sufficient to characterise the decay. 7. The muon is an unstable subatomic particle with a mean lifetime of, much longer than many other subatomic particles. 8. The half-life can be written in terms of the decay constant, or the mean lifetime , as: 9. So, how can it be that electron's " mean lifetime is 4.6?0 26 years "? 10. The comparison of those amounts allows for the determination of the mean lifetime as well as the half-life of muons. 
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