题目内容
在一次杨氏双缝干涉实验时,所有光源是波长等于6 000
的橙光,光屏上有一点与双缝距离之差为18 000
,则这一点将出现________条纹,若改用波长为4 000
的紫光进行实验,则这一点将出现________条纹.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653314365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653314365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653314365.png)
明 暗
出现亮纹的条件是光程差Δr=2n·
,(n=0,1,2,…)因为Δr=18 000
,λ=6 000
,故n=3,满足条件,为亮纹;出现暗纹的条件是光程差Δr=(2n+1)·
(n=0,1,2,…),因为Δr=18 000
,λ′=4 000
,故n′=4,满足条件,为暗纹.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653361423.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653314365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653314365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653361423.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653314365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003653314365.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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