题目内容
“利用双缝干涉测定光的波长”实验中,双缝间距d=0.4 mm,双缝到光屏的距离L=0.5 m,用某种单色光照射双缝得到干涉条纹如图所示,分划板在图中A、B位置时游标卡尺读数也如图中所示,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500525156110363.png)
(1)分划板在图中A、B位置时游标卡尺读数xA=11.1mm,则xB=________mm,相邻两条纹间距Δx=________mm;
(2)波长的表达式λ=________(用Δx、L、d表示),该单色光的波长λ=________m;
(3)若改用频率较高的单色光照射,得到的干涉条纹间距将_______(填“变大”、“不变”或“变小”)。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500525156110363.png)
(1)分划板在图中A、B位置时游标卡尺读数xA=11.1mm,则xB=________mm,相邻两条纹间距Δx=________mm;
(2)波长的表达式λ=________(用Δx、L、d表示),该单色光的波长λ=________m;
(3)若改用频率较高的单色光照射,得到的干涉条纹间距将_______(填“变大”、“不变”或“变小”)。
(1)15.6,0.75;(2)
,6.0×10-7;(3)变小。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005251686517.png)
试题分析::(1)B位置游标卡尺的读数为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005251702821.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052517171079.png)
(2)根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005251733686.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005251764696.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052517951310.png)
(3)根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005251733686.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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