题目内容
【选修3—4】一列横波沿
轴正方向传播,在t s与(t+0.8)s两时刻,在
轴上-3m~3m区间内的两波形图正好重合,如图所示.则下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250042409602941.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004240914266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004240914266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250042409602941.png)
A.质点振动周期一定为0.8s |
B.该波的波速可能为10m/s |
C.从t时刻开始计时,x=1m处的质点比x=-1m处的质点先到达波峰位置 |
D.在(t+0.4)s时刻,x=-2m处的质点位移可能为零 |
B (6分)
试题分析:由题分析得知,nT=0.8s,n=1,2,3…,周期
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004240976590.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004240992534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004241007952.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004241038786.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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