博文
换位一下 曝光一次
(2012-07-17 08:44:25)
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湖光山色
(2011-07-19 05:09:17)
Example#1Problem:a.)Whatistheenergyofasinglephoton(ineV)fromalightsourcewithawavelengthof400nm?Solution:UseE=pc=hc/l.ThisgivesanserinJoules,thenmultiplybyeVtogetanswerineV.3.1eVb.)Ifa50Wlaseremits400nmlight,howmanyphotonsareemittedin10seconds?Solution:In10seconds,500Joules=500/eVofphotonsareemitted.Dividingthistotalenergybytheenergyperphotongivesthetotalnumberofphotons.1.01E21---------------------...[阅读全文]
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今年夏天
(2011-06-27 21:56:05)
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