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人们在研究光电效应现象时发现,各种金属都存在着极限频率和极限波长,这一点无法用光的波动说解释.为此,爱因斯坦提出了光子说.
When people studied the phenomenon of photoelectric effects, they found that all kinds of metals have extreme frequencies and limit wavelengths. This cannot be explained by the fluctuation of light. For this reason, Einstein proposed the theory of photons.