题目内容
如图所示,实线是某时刻的波形图线,虚线是0.2s后的波形图线.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124493088517.png)
(1)若波向左传播,求它传播的最小距离;
(2)若波向右传播,求它的最大周期;
(3)若波速为35cm/s,求波的传播方向.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124493088517.png)
(1)若波向左传播,求它传播的最小距离;
(2)若波向右传播,求它的最大周期;
(3)若波速为35cm/s,求波的传播方向.
(1)△s=3m(2)0.8(s) (3)向左.
试题分析:(1)若波向左传播,则它传播的距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212450354683.png)
则最小距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212451695676.png)
(2)若波向右传播,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212452881725.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212453879742.png)
(3)当波向右传
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124550802100.png)
当波向左传
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124562822211.png)
可见,当波向左传播,k=1时,v=35cm/s
点评:难度较大,考查了波动图像的多解问题,由于波的传播方向未知造成多解问题,由于波动图像的重复性造成了多解
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目