Red is commonly used for danger and warning signals mainly because?

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1. Red is commonly used for danger and warning signals mainly because?

Blood happens to be red in colour

Red light is scattered the least by air molecules, letting it travel and remain visible over long distances

Red pigment is simply easy and cheap to produce

Red colour is generally more soothing to the human eye

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Since red light has the longest visible wavelength, it scatters the least in air, letting it stay visible clearly over greater distances than other colours — ideal for a warning signal.