题目内容
一列简谐横波沿
轴正向传播,P点振动周期为0.4s,在某一时刻波形如图所示,可判断 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241226012476897.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122601231187.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241226012476897.jpg)
A.P点此时刻振动方向沿y轴负方向 |
B.该波波速为7.5m/s |
C.在离波源为11m的Q点经0.9秒到达波谷 |
D.当Q点达到波谷时,E点达到波峰 |
C
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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