题目内容
一列简谐横波沿x轴正方向传播,t时刻波形图如图中的实线所示,此时波刚好传到P点,t+0.6s时刻的波形如图中的虚线所示,a、b、c、P、Q是介质中的质点,则以下说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242309547463135.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242309547463135.png)
A.这列波的波速可能为50m/s |
B.质点a在这段时间内通过的路程一定小于30cm |
C.若周期T=0.8s,当t+0.4s时刻开始计时,则质点c的振动方程为![]() |
D.若周期T=0.8s,则当t+0.5s时刻,质点b的位移小于P的位移 |
A
试题分析:根据波形图,此波在0.6s内传播的距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242309573821165.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242309587551601.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231000065615.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231001501508.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231002873761.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242310041371073.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231006228987.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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