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交通信号灯为何用红色、黄色和绿色?
2016-10-14 09:56:23
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    Red means "stop," green means "go," and yellow means "hurry up and make that damn light." Why those colors, though? Why not blue, purple, and brown? I have to admit that aside from a hunch that it had to do with wavelengths, I had no idea myself, so I decided to look into it.
​    红灯“停”,绿灯“行”,黄灯亮了“快点走”,但为什么交通信号灯要用这三个颜色,而不用蓝色、紫色或者褐色呢?必须承认除了直觉认为这与波长有关外,我完全不知道原因,所以我决定一探究竟。
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