题目内容
(5分)如图是一列简谐波在t=0时刻的波形图,介质中x=4m处质点沿y轴方向做简谐运动的表达式为y=5sin5
cm。关于这列波,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003444515677.jpg)
播方向移动2m
E.再经过
个周期的时间,x=4m处质点位于波谷
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000344435374.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003444515677.jpg)
A.波长为4m |
B.波速为l0m/s |
C.波沿x轴正方向传播 |
D.再经过半个周期的时间,x=4m处质点沿波的传 |
E.再经过
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000344466385.png)
ABE
试题分析:从波动图像可知,该机械波的波长为4m,所以A选项正确;据y=5sin5
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000344435374.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000344513309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000344560323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000344435374.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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