题目内容
(1)放射性物质
Po和
Co的核衰变方程分别为:
Po→
Pb+X1
Co→
Ni+X2
方程中的X1代表的是________,X2代表的是________.
(2)如图15-2-1所示,铅盒内装有能释放α、β和γ射线的放射性物质,在靠近铅盒的顶部加上电场E或磁场B,在图(a)、(b)中分别画出射线运动轨迹的示意图.(在所画轨迹上须标明是α、β和γ中的哪种射线)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241413231694933.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141322732408.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141322826369.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141322732408.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141323029410.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141322826369.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141323107394.png)
方程中的X1代表的是________,X2代表的是________.
(2)如图15-2-1所示,铅盒内装有能释放α、β和γ射线的放射性物质,在靠近铅盒的顶部加上电场E或磁场B,在图(a)、(b)中分别画出射线运动轨迹的示意图.(在所画轨迹上须标明是α、β和γ中的哪种射线)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241413231694933.jpg)
(1)
He
e (2)见解析图
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141323185292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141323231279.png)
(1)由质量数守恒可知X1、X2的质量数分别为4、0,由电荷数守恒可知X1、X2的电荷数分别为2、-1,故X1是
He,X2是
e.
(2)α粒子带正电,在图(a)电场中向右偏,在图(b)的磁场受到指向左侧的洛伦兹力向左偏,β粒子带负电,故在图(a)中向左偏而在图(b)中向右偏,γ粒子不带电,故不发生偏转,如图所示(曲率半径不作要求,每种射线可只画一条轨迹).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241413235755469.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141323185292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141323231279.png)
(2)α粒子带正电,在图(a)电场中向右偏,在图(b)的磁场受到指向左侧的洛伦兹力向左偏,β粒子带负电,故在图(a)中向左偏而在图(b)中向右偏,γ粒子不带电,故不发生偏转,如图所示(曲率半径不作要求,每种射线可只画一条轨迹).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241413235755469.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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