题目内容
一列简谐波沿x轴传播,t=0时刻的波形如图甲所示,此时质点P正沿y轴负方向运动,其振动图像如图乙所示,则该波的传播方向和波速分别是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003013489109.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003013489109.png)
A.沿x轴负方向,60m/s |
B.沿x轴正方向,60m/s |
C.沿x轴负方向,30 m/s |
D.沿x轴正方向,30m/s |
A
试题分析:根据甲图可知波沿X轴负方向传播,波长是24m,根据乙图可知,周期是0.4s,所以波速是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000301363564.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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