题目内容
如图甲所示,在杨氏双缝干涉实验中,激光的波长为5.30×
m,屏上P点距双缝
和
的路程差为7.95×
m,则在这里出现的应是 (选填“明条纹”或“暗条纹”).现改用波长为6.30×
m的激光进行上述实验,保持其他条件不变,则屏上的条纹间距将 (选填“变宽”、“变窄”或“不变”).![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241659298705333.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165928295361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165928638341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165929075374.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165928295361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165928295361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241659298705333.jpg)
暗条纹 变宽
试题分析:根据产生明条纹或暗条纹的条件就是看光程差是否为半波长整数倍,若是则为明条纹。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165929870709.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165930089702.png)
点评:本题考查了光的干涉现象中的明条纹、暗条纹的判断。通过公式可以分析处波长变长在其他条件不变时,条纹间距应变宽
![](http://thumb2018.1010pic.com/images/loading.gif)
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