题目内容
(1)一列简谐横波在均匀介质中沿x轴正方向传播,波源位于坐
标原点,在t =0时刻波源开始振动,在t ="3" s时刻的波形如图所示,此时,x ="3" m处的质点刚开始振动.则 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241241381841846.jpg)
(2)图示是一透明的圆柱体的横截面,其半径R=20cm,折射率为
,AB是一条直径,今有一束平行光沿AB方向射向圆柱体,试求:
①光在圆柱体中的传播速度;
②距离直线AB多远的入射光线,折射后恰经过B点.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241241385432937.jpg)
标原点,在t =0时刻波源开始振动,在t ="3" s时刻的波形如图所示,此时,x ="3" m处的质点刚开始振动.则 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241241381841846.jpg)
A.波源开始振动时的方向沿y轴正方向 | B.波源开始振动时的方向沿y轴负方向 |
C.t ="7" s时X ="2" m处的质点在波谷 | D.t ="7" s时X ="6" m处的质点在波峰 |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124138340227.gif)
①光在圆柱体中的传播速度;
②距离直线AB多远的入射光线,折射后恰经过B点.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241241385432937.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412413855927143.jpg)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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