题目内容
用波长为
的紫外线照射钨的表面,释放出来的光电子中最大的动能是4.7
。由此可知,钨的极限频率是(普朗克常量h=6.63
·s),光速c=3.0
/s,结果取两位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121706322596.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121706353496.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121706384516.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121706415485.png)
A.5.5![]() | B.7.9![]() | C.9.8![]() | D.1.2![]() |
B
本题主要考查了光电效应的理解,由光电效应方程
和波长与频率的关系
金属的逸出功
代入数据可知金属极限频率为7.9x1014HZ,选项B正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121706556727.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121706587494.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121706618589.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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