题目内容
一列横波如图所示,t1时刻波形为图中实线所示;t2时刻波形如图中虚线所示.已知Δt=t2-t1=0.5s,且3T<t2-t1<4T,则这列波的波速可能为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241422094987134.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241422094987134.png)
A.16m/s |
B.32m/s |
C.52m/s |
D.60m/s |
CD
如果波向右传播时,由实线平移到虚线所需时间为
,所以有
=0.5s,根据3T<t2-t1<4T,所以周期为
,由图像可知波的波长为8m,波速为
,同理,当波向左传播时波速为60m/s,CD对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142209592805.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142209592805.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142209732486.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142209779867.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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