题目内容
如图12-3-6所示,在平面xOy内有一沿水平轴x正向传播的简谐横波,波速为3.0 m/s,频率为2.85 Hz,振幅为8.0×10-2 m.已知t=0时,P点质点的位移为y=4.0×10-2 m,速度沿y轴正方向,Q点在P点右方9.0×10-1 m处,对于Q点的质点来说( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205388751408.jpg)
图12-3-6
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205388751408.jpg)
图12-3-6
A.在t=0时,位移为y=-4.0×10-2 m |
B.在t=0时,速度沿y轴负方向 |
C.在t="0.1" s时,位移为y=-4.0×10-2 m |
D.在t="0.1" s时,速度沿y轴正方向 |
BC
因为λ=
=
m,PQ=9×10-1 m,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120538922418.gif)
,按题意画出t=0时刻的波形图,如下图实线所示,由波形图可判定选项A错,选项B正确.周期T="0.4" s,Δt="0.1" s=
,波形向x轴正方向平移
如下图中虚线所示,则选项C正确.此刻Q点速度方向沿y轴负方向,选项D错.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205390163245.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120538891230.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120538907534.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120538922418.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120538969227.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120538985230.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120539000231.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205390163245.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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