题目内容
一列简谐横波沿直线水平向右传播,先后通过介质中的P、Q两质点。波速为
="80" m/s,频率为
="100" Hz,
、Q两质点的平衡位置相距
="6.6" m。若以Q质点开始振动的时刻作为计时的零点,Q质点的振动图像如图a所示。则
质点的振动图像是图b中的
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241243006316079.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300490274.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300537309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300553294.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300584326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300553294.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241243006316079.png)
D
波长
,
,所以PQ间距与相距
个周期一样,根据图a可知0时刻在平衡位置,起振方向向上,根据下坡向上可知,据波源
位置的质点处于平衡位置,且处于下坡位置,D正确
故选D
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241243006461001.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300662884.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300693303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124300693303.png)
故选D
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目