题目内容
(2011·上海高考物理·T24)两列简谐波沿x轴相向而行,波速均为
,两波源分别位于A、B处,
时的波形如图所示。当
时,M点的位移为 cm,N点的位移为 cm。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241410196195929.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141019463630.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141019510363.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141019557487.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241410196195929.jpg)
2,0
2.5s内,两列波传播的距离
,当A波向右传播1m时,
A波如图中的虚线所示,B波如图中的实线所示,所以,M点位移为2cm,N点位移为零,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414101971311214.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141019650944.png)
A波如图中的虚线所示,B波如图中的实线所示,所以,M点位移为2cm,N点位移为零,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414101971311214.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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