题目内容
如图甲所示,一列简谐横波在x轴由a向b传播,图乙和图丙分别为x轴上a、b两质点的振动图像,且xab=6m,求该波的波速。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342268447822.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342268447822.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134226922775.png)
(2)由题图乙、图丙可知
(2分)
而
(
=0,1,2,…) (4分)
在介质中,有
(2分)
联立解得
(
=0,1,2,…) (1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134227000428.png)
而
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134227062799.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134227109297.png)
在介质中,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134227187519.png)
联立解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134226922775.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134227109297.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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