题目内容
一列沿x轴正方向传播的简谐横波,t=0时刻的波形如图中实线所示,t=0.2s时刻的波形如图中的虚线所示,则此列简谐横波的波速为 m/s.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323446252643.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323446252643.png)
10(4n+1) n=0、1、2、3……(3分)
因为波是向x轴正方向传播,所以在t=0时刻O点处的质点正通过平衡位置向下振动,在t=0.2s时刻,O点处的质点到达波谷,所以质点至少经历了
时间,故
,由图像可知该波的波长为8m,根据公式
可得,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323449681145.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132344671389.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323447031100.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132344765517.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323449681145.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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