题目内容
静止的氮核
被速度为v0的中子
击中生成碳核
和另一种原子核甲,已知
与甲核的速度方向和碰撞前中子的速度方向一致,碰后碳核
与甲核的动量之比为l:1.
①写出核反应方程式.
②求
与甲核的速度各是多大?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546522442.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546537345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
①写出核反应方程式.
②求
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
①
②
的速度v1=
,氚核的速度v=![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546662440.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546615908.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546647478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546662440.png)
试题分析:①
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546615908.png)
②设中子质量为m0,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
由动量守恒得
m0v0=12mC v1+m甲v
即m0v0="12" m0 v1+3 m0v (2分)
又因为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546553425.png)
即12 m0 v1="3" m0v甲 (2分)
联立以上两个方程,得:v1 =
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546647478.png)
v=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002546662440.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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