题目内容
一个弹簧振子做受迫运动,它的振幅A与驱动力频率
之间的关系如图所示.由图可知( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403061722284.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140306047304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241403061722284.png)
A.频率为![]() |
B.驱动力频率为![]() ![]() |
C.振子如果做自由振动,它的频率是![]() |
D.振子可以做频率为![]() |
ACD
处于共振状态时,振幅最大,所以A正确,物体做受迫振动的频率等于驱动力的频率,所以驱动力频率为
时,受迫振动的振幅比共振小,但振子振动的频率为
,B错误,当驱动力频率等于物体固有频率时,振子处于共振状态,所以振子如果做自由振动,则它的频率为
,C正确,振子可以做频率为
的等幅振动,D正确,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140306281356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140306281356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140306235348.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140306547326.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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