题目内容
如图所示,在x轴上传播的一列简谐横波,实线表示t=0时刻的波形图,虚线表示在t=0.2s时刻的波形图。已知该波的波速是80m/s,则下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241304201923511.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241304201923511.png)
A.波长是10m |
B.周期是0.15s |
C.波可能沿x轴正方向传播 |
D.t=0时,x=4m处的质点速度沿y轴负方向 |
BD
由图可得
;
,向左传播
;
;t=0时,x=4m处的质点速度沿y轴负方向。答案选BD。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130420238558.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130420270627.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130420301489.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130420332729.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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