题目内容
如图甲所示,两平行金属板MN、PQ的板长和板间距离相等,板间存在如图乙所示的随时间周期性变化的电场,电场方向与两板垂直,不计重力的带电粒子沿板间中线垂直电场方向源源不断地射入电场,粒子射入电场时的初动能均为Ek0。已知t=0时刻射入电场的粒子刚好沿上板右边缘垂直电场方向射出电场。则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050160293121.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050160603938.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050160293121.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050160603938.jpg)
A.所有粒子最终都垂直电场方向射出电场 |
B.t=0之后射入电场的粒子有可能会打到极板上 |
C.所有粒子在经过电场过程中最大动能都不可能超过2Ek0 |
D.若入射速度加倍成2v0,则粒子从电场出射时的侧向位移与v0相比必定减半 |
AC
试题分析:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005016076363.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005016091431.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005016107962.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005016138412.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005016154526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050161691217.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目