题目内容
在研究
物体材料的热膨胀特性时,可采用如图所示的干涉实验法。
的上表面是一光滑平面,在
的上方放一个两面平行的玻璃板
,
与
的上表面平行,在它们之间形成一厚度均匀的空气薄膜。现用波长为
的单色光垂直照射玻璃板
,同时给
缓慢加热,在
的上方观察到
板的亮度发生周期性变化。当温度为
时最亮,然后亮度逐渐减弱至最暗;当温度升到
时,亮度再一次增到最亮,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631257763.png)
出现最亮时,
上表面反射光与
下表面反射光叠加后加强
出现最暗时,
下表面反射光与
上表面反射光叠加后加强
温度从
升至
过程中,
的高度增加![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631756413.png)
温度从
升至
过程中,
的高度增加![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133632380437.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630835326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631179295.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631225333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631257763.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631303311.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631459319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630586316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631569321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631179295.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631225333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631756413.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631896328.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631179295.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631225333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133630367302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133632380437.png)
D
本题考查薄膜干涉的应用,当光程差为波长整数倍时振动加强,为亮条纹,厚度的两倍是光程差,亮度最亮时厚度的2倍为波长的整数倍,所i以从
升至
过程中,厚度变化了
,D对
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631179295.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133631225333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133632380437.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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