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Why Are Warning Signs Red?
Why Are Warning Signs Red?0When we travel by car, we see many warning signs. Interestingly, all of them are red. This is because of the wavelength of the color red. Among many different colors, red has the longest wavelength. If colors have long wavelengths, there is less scattering of light. This means colors can penetrate the air well. For this reason, we can find red warning signs easily, even on a foggy and rainy day!

Yejin Hwang
Staff Reporter
 
인쇄기능입니다.
1. How can we find red warning signs easily, even on a foggy and rainy day?
 
1. What was the most interesting warning sign that you have seen so far?
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