题目内容
图甲为一列横波在t=0时的波动图象,图乙为该波中x=2m处质点P的振动图象,下列说法正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241340335413170.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241340335413170.png)
A.波速为6m/s; |
B.波沿x轴负方向传播; |
C.再过0.5s,P点的动能最大; |
D.再过2.5s,P点振动路程为1.8cm |
C
由图得周期T=1.0s,波长
,波速
,A错误;根据P点的振动情况可知波沿x轴正方向传播,B错误;再过0.5s,P处于平衡位置,动能最大,C正确;再过2.5s,P点振动路程为
,D错误。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134033587534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134033634818.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134033697988.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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