题目内容
(10分)一列简谐波沿x轴正方向传播,t=0时波形如图甲所示,已知在0.6s末,A点恰第四次(图中为第一次)出现波峰,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003071829417.jpg)
(1)该简谐波的波长、波速分别为多少?
(2)经过多少时间x=5m处的质点P第一次出现波峰?
(3)如果以该机械波传到质点P开始计时,请在图乙中画出P点的振动图象,并标明必要的横、纵坐标值,至少画出一个周期的图象.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003071829417.jpg)
(1)该简谐波的波长、波速分别为多少?
(2)经过多少时间x=5m处的质点P第一次出现波峰?
(3)如果以该机械波传到质点P开始计时,请在图乙中画出P点的振动图象,并标明必要的横、纵坐标值,至少画出一个周期的图象.
(1)
,
m/s(2)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003072296331.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000307198497.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000307213396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000307213534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003072296331.jpg)
试题分析:(1)由图可知,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003072601003.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000307276622.png)
(2)波峰传到P点,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003073071032.png)
(3)由甲图可知,质点起振的方向为经平衡位置向下振动,振动图象如图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003072296331.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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