题目

已知某金属表面在波长为λ和2λ的单色光照射时,释放出的光电子的最大初动能分别为30 eV和10 eV.则能使此金属表面产生光电效应的入射光的极限波长是多少? 答案： 4λ 解析:本题考查光电效应方程的应用. E 1=h－W                                                                                                   (2分) E 2=h－W                                                                                                   (2分) W=h                                                                                                           (2分) 由以上三式联立解得  λ0=4λ.                                                                       (3分)

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