题目内容
如图所示,一横波的波源在坐标原点,x轴为波的传播方向,
轴为振动方向.当波源开始振动1s时,形成了如图所示的波形(波刚传到图中
点).试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412059499632.png)
①从图示位置再经多长时间波传到
点?
②波传到
点时质点
的位移.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141205699310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141205730289.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412059499632.png)
①从图示位置再经多长时间波传到
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206011333.png)
②波传到
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206011333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141205730289.png)
①
;②10cm
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206245453.png)
①如图所示,根据图像,波的波长![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206323534.png)
波速为
(1分)波传到Q点用的时间
(1分)
②质点振动的周期:
P质点开始向下振动,波经P点传到Q点的时间为
周期(1分)
则此时质点P的位移为10cm(1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206323534.png)
波速为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206432816.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206542820.png)
②质点振动的周期:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206588432.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206635385.png)
则此时质点P的位移为10cm(1分)
![](http://thumb2018.1010pic.com/images/loading.gif)
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