题目内容
如图所示,一列简谐横波在x轴上传播,图甲和图乙分别为x轴上a、b两质点的振动图象,且xab=6m.下列判断正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053318724481.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053318724481.jpg)
A.波一定沿x轴正方向传播 | B.波长可能是8m |
C.波速一定是6m/s | D.波速可能是2m/s |
BD
试题分析:由振动图象无法比较a、b两质点振动的先后,所以无法判断波的传播方向.故A错误.若波沿x轴正方向传播时,由振动图象读出t=0时刻,a质点经过平衡位置向下运动,而b位于波峰,结合波形得到:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005331887813.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053319031090.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005331918987.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005331950843.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005331965876.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005331965550.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005331965876.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005331996571.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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