题目内容
一列简谐横波沿x轴正方向传播,t=0时刻的波形如图所示,介质中质点P、Q分别位于x=2 m、x=4 m处.从t=0时刻开始计时,当t=15 s时质点Q刚好第4次到达波峰.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037019563152.png)
(1)求波速.
(2)写出质点P做简谐运动的表达式(不要求推导过程).
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037019563152.png)
(1)求波速.
(2)写出质点P做简谐运动的表达式(不要求推导过程).
(1)1 m/s (2)y=0.2sin(0.5πt) m
试题分析:(1)从图示开始Q点还需要
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003701956488.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003701972687.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003701987425.png)
从图中可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003702003519.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003702019810.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003702034801.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003702050159.png)
点评:做此类题的关键是能从图像中挖出相应的信息,根据题中的条件分析
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目