题目内容
A、B两列简谐横波均沿x轴正向传播,在某时刻它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
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342509307586.png)
A.1∶1 B.1∶2 C.1∶3 D.3∶1
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342509307586.png)
A.1∶1 B.1∶2 C.1∶3 D.3∶1
D
由图甲得
,由图乙得
,经过时间t(t小于A波的周期TA),A波从甲到丙得t=
,
;B波从乙到丁得
(n=1、2、3、……),
,
,联立得
(n=1、2、3、……),当n=1、2、3时,比值分别为1:1、1:2、1:3,ABC错,D对。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342509771192.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251008655.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251055465.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251180516.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251273778.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251320998.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342513511064.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251398943.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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