Red light is used for danger signals because it has the longest wavelength among visible colors. According to Rayleigh scattering theory, the intensity of scattered light is inversely proportional to the fourth power of its wavelength (I ∝ 1/λ⁴). Therefore, light with longer wavelengths (like red) is scattered the least by atmospheric particles (dust, smoke, fog).
79.Red light is used for danger signals becaus it:
Asked in UPPCS Prelims 1995 · Topic: Optics (Prisms and Dispersion)
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