Answers

2016-01-19T04:26:19+05:30
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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thankyou for the correct ans.
mention not.. :D
2016-01-19T07:35:24+05:30
Because red is sign of danger
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