题目内容
一列横波沿
轴传播,下左图是波上某一质点
的振动图线。下右图为这列横波在0.1s时刻的波形图。由此可以判断该波的传播速度和传播方向是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412461527217709.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124615085271.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124615101296.png)
A.1m/s,沿![]() | B.1m/s,沿![]() |
C.0.5m/s,沿![]() | D.0.5m/s,沿![]() |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412461527217709.png)
A
从图中可以读出周期为0.2s,波长为20cm=0.2m,根据
,计算可得波速为1m/s,0.1s时刻根据振动图像可知,速度方向向下,上坡向下,所以波向正方向传播
故选A
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124615303517.png)
故选A
![](http://thumb2018.1010pic.com/images/loading.gif)
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