题目内容
一群氢原子处于量子数n=4的能级状态,氢原子的能级图如图所示,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241715414564846.jpg)
(1)氢原子可能发射几种频率的光子?
(2)氢原子由量子数n=4的能级跃迁到n=2的能级时辐射光子的能量是多少电子伏?
(3)若已知钠的极限频率为6.00×1014Hz,今用一群处于n=4的激发态的氢原子发射的光谱照射钠. 试通过计算说明有几条谱线可使钠发生光电效应?(h=6.63×10-34J.s)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241715414564846.jpg)
(1)氢原子可能发射几种频率的光子?
(2)氢原子由量子数n=4的能级跃迁到n=2的能级时辐射光子的能量是多少电子伏?
(3)若已知钠的极限频率为6.00×1014Hz,今用一群处于n=4的激发态的氢原子发射的光谱照射钠. 试通过计算说明有几条谱线可使钠发生光电效应?(h=6.63×10-34J.s)
(1)6种(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241715418461279.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171541471527.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241715418461279.png)
试题分析:(1)根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171542158507.png)
(2)根据公式可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241715423611182.png)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171542563919.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241715418461279.png)
点评:解决本题的关键掌握光电效应的条件,以及知道能极差与辐射的光子能量的关系.
![](http://thumb2018.1010pic.com/images/loading.gif)
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