题目内容
(10分) 一点光源以功率P向外发出波长为λ的单色光,以h表示普朗克恒量,c表示光速.
(1)求光源每秒种发出的光子数目.
(2)若能引起视觉反映的光的最小强度是人的视网膜每秒钟单位面
积上获得n个光子的能量.求当人距离光源多远时将看
不到光源.
(1)求光源每秒种发出的光子数目.
(2)若能引起视觉反映的光的最小强度是人的视网膜每秒钟单位面
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412133230565.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412133232172.gif)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332352450.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332368570.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332352450.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332368570.gif)
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332352450.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332368570.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332383582.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332352450.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332414464.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332368570.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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