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Class 12 Tuition > Learn Class XI-XII Tuition (PUC) > Why red is the sign of danger?
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Why red is the sign of danger?

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CSIR NET,UGC NET, GMAT, BANK P.O.,IIT FOUNDATION COURSE, QUANTITATIVE APTITUDE Etc.

Red colour is able to travel the longest distance & visible most from long distance.
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The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. Therefore blue which has the least wavelength of all the visible radiations is scattered...
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The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. Therefore blue which has the least wavelength of all the visible radiations is scattered the most and red which has the highest wavelength of all the colors we can see is scattered the least. So red light is able to travel the longest distance through fog, rain, and the alike. read less
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Physics and Maths made easy

It is because red light is prone to least scattering (as per Rayleigh's formula) and hence it has maximum range through the air (atmosphere). This enables to see the signal (red) from a long distance.
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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

Because it has longer wavelength. we can see red colour sign from far distance in any weather.
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Bachelor Of Engineering (Computer Science)

It have higf wavelength so it reach faster than any other colour.
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Mathematics

Because red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. Therefore blue which has the least wavelength of all the visible radiations is scattered the most and red which has the highest wavelength of all...
read more
Because red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. Therefore blue which has the least wavelength of all the visible radiations is scattered the most and red which has the highest wavelength of all the colors we can see is scattered the least. So red light is able to travel the longest distance through fog, rain, and the alike. read less
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It is because red light is scattered the least by air molecules. The effect of scattering is inversely proportional to the fourth power of wavelength of a colour. And because, red colour(among all the visible colours) has the highest wavelength, it gets scattered the least when compared to others.
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This property of least scattering makes it visible from a large distance and is thus, used as a sign of danger.
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Mechanical Engineer

Wavelength of red light is more than other colors, thus can cover great distance and scattering by fog or rain or by air molecules is highly reduced. Thus making it the ideal color for danger sign.
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As scattering is inversely proportional to the 4th power of wavelength of light and the red colour light has highest wavelength among the visible colours so for this colour, scattering is the least as a result it can be visible easily through a long distance as well !!....that is why it is used as...
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As scattering is inversely proportional to the 4th power of wavelength of light and the red colour light has highest wavelength among the visible colours so for this colour, scattering is the least as a result it can be visible easily through a long distance as well !!....that is why it is used as the sign of danger. read less
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