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half-life中文是什么意思

发音:  
用"half-life"造句"half-life"怎么读"half-life" in a sentence"half-life"的同义词

中文翻译手机手机版

  • 【原子能】半衰期〔放射性同位素分裂[从生物体中排出]一半量的时间〔也作 half life 或 half life period〕〕。

例句与用法

  • It has a half-life of about 41/2 billion years .
    它的半衰期大约为45亿年。
  • The half-life of francium is 22 minutes .
    钫的半衰期是22分钟。
  • Evolutionists have recently learned that groups of species also have what might be called a half-life .
    进化论者最近发现生物属种也具有一种可以称为半死亡期的时期。
用"half-life"造句  

英文解释

  • the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
    同义词:half life,

百科解释

Half-life (t?) is the time required for a quantity to fall to half its value as measured at the beginning of the time period. In physics, it is typically used to describe a property of radioactive decay, but may be used to describe any quantity which follows an exponential decay.
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