A Complete Collection of 100000 Whys
Fav十万个为什么
灯为什么会发光？
灯会发光主要是因为电流通过灯丝或半导体材料时，使原子或分子激发并释放能量，具体原因如下：
1、电流通过灯丝：在白炽灯中，电流通过灯丝（通常是钨丝）时，使灯丝温度升高到白炽状态，从而发出可见光。
2、电子与空穴复合：在LED灯中，电流通过半导体材料时，电子与空穴复合，释放能量，产生光子，从而发光。
3、气体放电：在荧光灯中，电流通过汞蒸气等气体时，使气体原子激发并发出紫外线，然后紫外线激发荧光粉发出可见光。
总结：灯会发光主要是因为电流通过灯丝或半导体材料时，使原子或分子激发并释放能量，产生光子，从而发光。
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