题目内容
A、B两列简谐横波均沿x轴正向传播,某时刻的他们的波形分别如图甲、乙所示,经过时间t(t小于A波的周期TA),这两列简谐横波的波形分别变为图丙、丁所示,则A、B两列波的波速vA、vB之比不可能是
A.1∶1 B.3∶2 C.1∶3 D.3∶1![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413365010112376.png)
A.1∶1 B.3∶2 C.1∶3 D.3∶1
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413365010112376.png)
BD
甲图变到丙图经历的时间为
,乙图变化到丁图经历的时间为
,A波的波长为24cm,B波的波长为12cm,
,由于t小于A波的周期TA),则n=0,t=5T1,A波的波速为
,B波的波速为
,BD对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133650133838.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133650211455.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133650273679.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133650304917.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133650351888.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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