Why is red colour preferred for danger signal lights?
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A.
Because red colour light has shorter wavelength
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B.
Because red colour is preferred by many
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C.
Because red colour light has longest wavelength and least scattered by fog and smoke
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D.
Because red colour is bright to eyes
Correct Answer:
C. Because red colour light has longest wavelength and least scattered by fog and smoke
Explanation:
Red light is preferred for danger signals primarily because it has the longest wavelength in the visible spectrum. According to Rayleigh scattering, the amount of light scattered by particles like fog, smoke, or dust is inversely proportional to the fourth power of its wavelength. Because red has the highest wavelength, it is scattered the least by atmospheric interference, allowing the signal to remain visible from a much greater distance and in poor weather conditions compared to other colors. Additionally, the human eye is highly sensitive to red, and it is internationally recognized and psychologically associated with stop, caution, and urgency.
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