题目内容
一列简谐横波向右传播,在其传播路径上每隔L="0.1" m选取一个质点,如图甲所示,t=0时刻波恰传到质点1,并立即开始向上振动,经过时间?t="0.3" s,所选取的1-9号质点第一次出现如图乙所示的波形,则该波的( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082417451698814832.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082417451698814832.jpg)
A.周期为0.3 s,波长为0.8 m | B.周期为0.2 s,波长为0.9 m |
C.周期为0.2 s,波速为4 m/s | D.周期为0.3 s,波速为2.67 m/s |
C
试题分析:由乙图得到波长
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174517004602.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174517207630.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174517425499.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174517628818.png)
点评:本题首先考查波的特性:介质各质点起振方向与波源起振方向相同这个知识点,又考查分析、判断、推理能力.
![](http://thumb2018.1010pic.com/images/loading.gif)
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