Danger signals use ___colored light.

Because red light scatters the least

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Because red light undergoes total internal reflection

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Because red light scatters the most

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None of these

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Solution

The correct option is A
Because red light scatters the least

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.

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Red color is used in danger signal because it scatters to a wider angle.

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