题目内容
如图所示,实线是一列简谐波在某一时刻的波形图线,虚线是0.2s后它的波形图线。求这列波的传播速度![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413311526325231.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413311526325231.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331153091674.png)
从图上可以看出λ=4m。…………………………………1分
当波沿x正方向传播时,两个波形之间间隔的时间为:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115372866.png)
而
………………………………2分
由波速公式:
代入数据
解得:
…… 2分
当波沿X负方向传播时,两次波形之间间隔的时间为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331156841106.png)
而
…………………………………2分
由波速公式:
代入数据
解得:
……………2分
当波沿x正方向传播时,两个波形之间间隔的时间为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115372866.png)
而
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115434793.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115465817.png)
由波速公式:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115590507.png)
解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331156371598.png)
当波沿X负方向传播时,两次波形之间间隔的时间为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331156841106.png)
而
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115731821.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115793882.png)
由波速公式:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133115840519.png)
解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331158871692.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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