题目内容
一列简谐横波沿x轴传播,周期为T,t=0时刻的波形如图所示,此时平衡位置位于x=3 m处的质点正在向上运动,若a、b两质点平衡位置的坐标分别为xa=2.5 m,xb=5.5 m,则当a质点处在波峰时,b质点恰在________(填“波峰”、“波谷”或“平衡位置”);t=
时,b质点正在向y轴________(填“正方向”或“负方向”)运动.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053266464026.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005326630484.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053266464026.jpg)
平衡位置(2分); 负方向
试题分析:由图可看出波长为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005326661533.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005326692363.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005326708485.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053267241205.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005326630484.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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