题目内容
一列向右传播的横波在t=0时的波形如图所示,A、B两质点间距为8m,B、C两质点平衡位置的间距为3m,当t=1s时,质点C恰好通过平衡位置,该波的波速可能为( )
(A)
m/s (B)11m/s (C)13m/s (D)37m/s ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241354075192014.png)
(A)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135407472313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241354075192014.png)
BCD
若质点C通过平衡位置向下传播,在t=1s时相当于波向前传播了
m即
,所以
,故CD正确。若质点通过平衡位置向上传播,则在t=1s时相当于波向前传播了
m,所以
,故B正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135407581510.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135407613619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135407659541.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135407753520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135407815552.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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