Glossary term: 光电效应
Description: 当光或其他电磁辐射照射到材料上时，电子会根据材料和光的频率不同，以不同能量被发射出来：这就是光电效应。这个现象可以通过把光看作称为光子的粒子或能量包来解释。对于材料（主要是金属）来说，光的频率应大于阈值频率（材料的特性），才会发生这些光电子的发射。它们的最大能量由频率决定；提高光的频率会增加电子的最大动能。增加单色光的强度会释放出更多的电子，但电子的最大动能却不会变化。这是因为光的强度与光子的数量成正比。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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