题目内容
一列横波沿x轴传播,如图所示,t1时刻的波形图为实线,t 2时刻的波形图为虚线,已知t 2 = t 1 +0.125s,则波的传播方向和传播距离可能是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403217884133.jpg)
A.沿x轴正方向,9m |
B.沿x轴负方向,3m |
C.沿x轴正方向,3m |
D.沿x轴负方向,9m |
CD
从图中我们可以得出波长为12m,若波沿X轴正方向传播,则从实线变成虚线经过了
,即
,根据公式
可得
,所以在0.125s内波传播的距离为
,故但n=0时,波传播了3m,C正确。若波沿x负方向传播,则从实线变成虚线经历了
,即
,所以波速为
,波向前传播了
,当n=0时,波传播了9m,D正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140321850956.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403220841171.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140322131517.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403221931107.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403222711026.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140322303986.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403223341205.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403224121136.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403224901023.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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