题目内容
在图12-3-5所示的图象中,实线是一列简谐横波在某一时刻的图象,经过t="0.2" s后这列波的图象如图中虚线所示,求这列波的波速.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201033171872.jpg)
图12-3-5
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241201033171872.jpg)
图12-3-5
当沿x轴正方向传播,
=
="5(4n+1)" m/s(n=0,1,2,…)
当沿x轴负方向传播,
=
="5(4n+3)" m/s(n=0,1,2,…).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103348244.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103363531.gif)
当沿x轴负方向传播,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103379354.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103395530.gif)
设波沿x轴正方向传播,t="0.2" s可能是(n+
)(n=0,1,2,…)个周期,即t=(n+
)T1,
周期T1=
=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103441427.gif)
波速v1=
=
="5(4n+1)" m/s(n=0,1,2,…)
设波沿x轴负方向传播,t="0.2" s可能是(n+
)(n=0,1,2,…)个周期,即t=(n+
)T2
周期T2=
=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103566430.gif)
波速v2=
=
="5(4n+3)" m/s(n=0,1,2,…).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103410221.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103410221.gif)
周期T1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103441482.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103441427.gif)
波速v1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103348244.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103363531.gif)
设波沿x轴负方向传播,t="0.2" s可能是(n+
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103504223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103504223.gif)
周期T2=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103535421.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103566430.gif)
波速v2=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103379354.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120103395530.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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