Question

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?

Answer 1

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)