题目内容
(2011年山东青岛一模)一列沿x轴正方向传播的简谐横波在t=0时的波形如图所示,已知t=0.6 s时,B点第三次出现波峰.则这列波的周期是多少?x=50 cm处的质点A回到平衡位置的最短时间为多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412305662197.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412305662197.jpg)
:0.24 s 0.1 s
:由题意得t=2
T,解得T=0.24 s
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412306444340.png)
由图象可知,λ=120 cm=1.2 m,v=
=5 m/s
x=50 cm处的质点A回到平衡位置的最短时间为
t′=
=0.1 s.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141230581338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412306444340.png)
由图象可知,λ=120 cm=1.2 m,v=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141230690427.png)
x=50 cm处的质点A回到平衡位置的最短时间为
t′=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141230753369.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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