题目内容
图甲是回旋加速器的工作原理图。D1和D2是两个中空的半圆金属盒,它们之间有一定的电势差,A处的粒子源产生的带电粒子,在两盒之间被电场加速。两半圆盒处于与盒面垂直的匀强磁场中,所以粒子在半圆盒中做匀速圆周运动。若带电粒子在磁场中运动的动能Ek随时间t的变化规律如图乙所示,不计带电粒子在电场中的加速时间,不考虑由相对论效应带来的影响,下列判断正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500201622212634.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500201622212634.jpg)
A.在Ek-t图中应该有tn+1- tn =tn-tn-1 |
B.在Ek-t图中应该有tn+1- tn <tn-tn-1 |
C.在Ek-t图中应该有En+1- En =En-En-1 |
D.在Ek-t图中应该有En+1-En <En-En-1 |
AC
试题分析:磁场中带电粒子做匀速圆周运动,洛伦兹力提供向心力,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002016254761.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002016269668.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002016285941.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002016300662.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002016316716.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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