题目内容
(12分)一个静止的氡核
发生α衰变后变成了一种新核X,现测得α粒子的质量m1,速度v1,新核的质量m2;①写出该核反应方程;②求新核的速度v2 ;③若核反应过程中释放出来的核能全部转变为α粒子和新核的动能,求氡核的质量m0.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257545525.png)
①
或
②![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257733639.png)
③![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402577951202.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257623970.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257701981.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257733639.png)
③
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402577951202.png)
①
或![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257701981.png)
②由动量守恒得:
,解得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257733639.png)
③设质量亏损
,释放出来的核能
,依题意有![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402583721004.png)
则氡核的质量
,解得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402577951202.png)
本题考查的是选修3-5部分的知识,包括光电效应,能级跃迁,动量守恒和核反应方面的知识。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257623970.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257701981.png)
②由动量守恒得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140258045572.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140257733639.png)
③设质量亏损
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140258201434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140258279678.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402583721004.png)
则氡核的质量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140258435710.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402577951202.png)
本题考查的是选修3-5部分的知识,包括光电效应,能级跃迁,动量守恒和核反应方面的知识。
![](http://thumb2018.1010pic.com/images/loading.gif)
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