Why red lamp is used in signal of dangers?

1.	Why red lamp is used in signal of dangers?
Answer» According to lord rayleigh, intensity of scattering of light ray (I) is inversely proportional to the fourth power of wavelength (λ) of ray. i.e., I ∝ 1/λ⁴ As red light has got largest wavelength so its scattering will be much lesser so it moves to a greatest distance than any other ray. So it is used in signal.

Answer»

According to lord rayleigh, intensity of scattering of light ray (I) is inversely proportional to the fourth power of wavelength (λ) of ray.

i.e., I ∝ 1/λ⁴

As red light has got largest wavelength so its scattering will be much lesser so it moves to a greatest distance than any other ray. So it is used in signal.

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Why red lamp is used in signal of dangers?

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