题目内容
图中的实线是0时刻的波形图象,虚线是经过0.2 s时的波形图象.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241353158984895.jpg)
(1)假定波向左传播,求它传播的可能距离.
(2)若这列波向右传播,求它的最大周期.
(3)假定波速是35 m/s,求波的传播方向.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241353158984895.jpg)
(1)假定波向左传播,求它传播的可能距离.
(2)若这列波向右传播,求它的最大周期.
(3)假定波速是35 m/s,求波的传播方向.
(1)(4n+3)m(2)Tm=0.8s(3)向左传播
(1)向左传播时传播的距离为
s=(n+
)λ=(n+
)×4 m =(4n+3)m (n=0、1、2…)
(2)根据t=(n+
)T 得T=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135316366662.png)
在所有可能的周期中,当n=0时的最大,故Tm=0.8s
(3)波在0.2 s内传播的距离s=vt="7" m,等于
个波长,故可判得波向左传播.
s=(n+
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135315914450.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135315914450.png)
(2)根据t=(n+
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135316335360.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135316366662.png)
在所有可能的周期中,当n=0时的最大,故Tm=0.8s
(3)波在0.2 s内传播的距离s=vt="7" m,等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135316413891.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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