Abhishek Padhy , asked a question
Subject: Science , asked on 11/1/11

Why the Danger Signals are red in Colour ?

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Guru Prasad Singh , added an answer, on 12/1/11
871 helpful votes in Science

 Danger signals are red in colour due to the following reasons-

1.It has the highest wavelenght in all colours and due to its property it is visible from far distance

2.It is least scattered by fog,cloudy weather and translucent situations

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Mariam Hamsheeda , added an answer, on 11/1/11
20 helpful votes in Science

red colour has highest wavelength and is least scattered by fog ,etc. this property makes it possible to see signal from far distances

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soorampalli_keerthana... , added an answer, on 12/1/11
131 helpful votes in Science

I think the major reason has to do with how light gets absorbed in fog,
particulates, haze, etc.
We know that light is scattered (and thus attenuates or gets weaker) as it
travels through a scattering medium composed of small particles.

As it turns out, red light is scattered (is weakened) less than other
colors.  In fact, of the light spectrum, blue is scattered the most and red
the least.

red light weakens the least in traveling in the air.  That is
why stop signs and other critical lights are red.

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Kamil Hasan , added an answer, on 11/1/11
160 helpful votes in Science

red colour is least scattered by fog mist or dust and is of longer wavelengths hence guring emergencies it bcomes easy to spot the colour and do the needful  !!

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Ajay T.s. , added an answer, on 12/1/11
1727 helpful votes in Science

Hi Abhishek!

Please refer to the answer given by Soorampalli.

All of you have done a good work!! Keep posting!!

Cheers!!

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Manish Dash , added an answer, on 11/1/11
60 helpful votes in Science

 Red colour is used in danger signals due to the following reasons -

1. Wavelength of RED colour is most in the VIBGYOR series. If wavelength is more, it is less scattered.

2. It is least scattered by other particles like fog,smoke. As it is least scattered , less light deviates from its original path. Hence more light reflects back and reaches our eyes. Hence we can see RED colour properly even on a foggy day.

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Chandni , added an answer, on 11/1/11
108 helpful votes in Science

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. Also, red is a color we inherently perceive as one that is associated with danger. I guess it has been genetically programmed as hot objects are red in color and also red is the color of blood. These reasons make danger signals the most effective when they are painted in red.


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