题目内容
在O点有一波源,t=0时刻开始向上振动,形成向右传播的一列横波。t1=4s时,距离O点为3m的A点第一次达到波峰;t2=7s时,距离O点为4m的B点第一次达到波谷。则以下说法正确的是( BC )
A.该横波的波长为2m |
B.该横波的周期为4s |
C.该横波的波速为1m/s |
D.距离O点为1m的质点第一次开始向上振动的时刻为6s末 |
BC
:
由
得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716596563.gif)
解得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716611495.gif)
波长![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716627441.gif)
振动从O传到距离O点为1m的质点所需时间![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716643571.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412471654973.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716565447.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716580529.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716596563.gif)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716611495.gif)
波长
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716627441.gif)
振动从O传到距离O点为1m的质点所需时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124716643571.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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