题目内容
如图13中实线是一简谐波在t=0时的波形图,虚线是该波在t=0.5s时的波形图。已知该简谐波的周期T>0.5s,试求:
(1)该波的传播速度;
(2)若波沿x
轴负方向传播,求它的频率.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241232543513740.jpg)
(1)该波的传播速度;
(2)若波沿x
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412325428965.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241232543513740.jpg)
(1)由图中可知,波长
,若波向右传播,两波形相距1/4个波长,即它们相差的时间,其周期为:T=2.0s, 波速为:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123254382530.gif)
若波向左传播,则
,所以 T="2/3" s,波速为:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123254414526.gif)
(2)由上一问知,波向左传播时,T="2/3" s,频率;f=1.5Hz.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123254367385.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123254382530.gif)
若波向左传播,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123254398556.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123254414526.gif)
(2)由上一问知,波向左传播时,T="2/3" s,频率;f=1.5Hz.
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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