题目内容
用波长为4×10-7m的紫光照射某金属,发出的光电子垂直进入3×10-4T的匀强磁场中,光电子所形成的圆轨道的最大半径为1.2cm(电子电荷量e=1.6×10-19C,其质量m=0.91×10-30kg).则下列说法正确的是
A.紫光光子的能量可用E=h![]() |
B.光电子的最大初动能可用Ek=![]() |
C.该金属发生光电效应的极限频率约4.75×1014Hz |
D.该金属发生光电效应的极限频率约4.75×1015Hz |
ABC
试题分析:紫光光子的能量可用E=h
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212051424397.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212053436883.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212054216769.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242120551211185.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212056338821.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212057133622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242120583031233.png)
故选ABC
点评:关键是对公式的灵活掌握,基础题,难度适中
![](http://thumb2018.1010pic.com/images/loading.gif)
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