题目内容
两个放射性元素样品A、B,当A有15/16的原子核发生衰变时,B恰好有63/64的原子核发生衰变,求A和B的半衰期之比TA :TB为多少?
3:2
设这段时间为t ,由题知,A有1/16未发生衰变, B有1/64未发生衰变, 由衰变规律得
(2分)
(2分)
又因:
,
(2分)
解之得:
(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115318935731.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115318951765.gif)
又因:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115318966400.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115318997419.gif)
解之得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115319013554.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目