题目内容
如图是一个示波管工作原理图的一部分,电子经过加速后以速度v0垂直进入偏转电场,离开偏转电场时的偏转量为y,两平行板间距为d、板长为L、板间电压为U。每单位电压引起的偏转量(y/U)叫做示波管的灵敏度,为了提高灵敏度,可以采用的方法是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041046771873.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041046771873.png)
A.增加两板间的电势差U |
B.尽可能缩短板长L |
C.尽可能减小板距d |
D.使电子的入射速度v0大些 |
C
试题分析:电子以初速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004104693323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004104724465.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004104786703.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041048171230.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041048491003.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004104693323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004104880321.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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