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Ultraviolet light of wavelength 350 nm and intensity 1.00 W/m2 is directed at a potassium surface.The maximum kinetic energy of the photoelectrons is（）

Ultraviolet light of wavelength 350 nm and intensity 1.00 W/m2 is directed at a potassium surface.The maximum kinetic energy of the photoelectrons is（）
A.17.6 eV
B.4.42×10-19 J
C.3.5 eV
D.6.9 eV
正确答案：3.5 eV

标签：原子物理

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