题目内容
(12分)太阳现正处于主序星演化阶段.它主要是由电子和
、
等原子核组成.维持太阳辐射的是它内部的核聚变反应,核反应方程是
,放出的核能最后转化为辐射能(普朗克常量
J·s).要求:
(1)已知质子质量mp,氦核的质量mα,电子质量me,光速c.求每发生一次上述聚变反应所释放的核能;
(2)用上述辐射中产生的波长为400nm某一单色光去照射逸出功为3.0×10-19J金属材料铯时,能否产生光电效应?若能,求出产生的光电子的最大初动能.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906005226.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906083266.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906177638.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906177493.gif)
(1)已知质子质量mp,氦核的质量mα,电子质量me,光速c.求每发生一次上述聚变反应所释放的核能;
(2)用上述辐射中产生的波长为400nm某一单色光去照射逸出功为3.0×10-19J金属材料铯时,能否产生光电效应?若能,求出产生的光电子的最大初动能.
(12分)解析:(1)E![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906239865.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906255365.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241219063953123.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906239865.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906255365.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241219063953123.jpg)
(12分)解析:(1)释放的核能:
(4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241219069101064.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906239865.gif)
(2)单色光的能量为:
(4分)
所以可以产生光电效应.最大初动能为:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121907019464.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906255365.gif)
(4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906598719.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241219069101064.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906239865.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906972923.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906988762.gif)
所以可以产生光电效应.最大初动能为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121907019464.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121906255365.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241219072223124.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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