题目内容
一列横波如图所示,波长
m,实线表示
时刻的波形图,虚线表示
s时刻的波形图.求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005072562157.png)
(1)波速多大?
(2)若
,波速又为多大?
(3)若
,并且波速为3600m/s,则波沿哪个方向传播?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507209448.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507225394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507240536.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005072562157.png)
(1)波速多大?
(2)若
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507271646.png)
(3)若
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507303518.png)
(1)波向x正向传播时1600n+400m/s;向x负向传播时1600n+1200m/s(n = 0、1、2、……,)(2)波向x正向传播时2000m/s;向x负向传播时2800m/s(3)沿x轴向右传播。
试题分析:(1)若波沿x轴正方向传播,可能的波速为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005073181245.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005073341247.png)
(2)若波沿x轴正方向传播,则波速为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507349960.png)
若波沿x轴负方向传播,则波速为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005073811004.png)
(3)波是沿x轴向右传播的。
![](http://thumb2018.1010pic.com/images/loading.gif)
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