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(A) According to Rayleigh's law of scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength $(I \p

Vedclass · Accepted Answer

is scattered the least by smoke or fog

Vedclass · Answer

(A) According to Rayleigh's law of scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength $(I \propto 1/\lambda^4)$.Since red light has the longest wavelength in the visible spectrum, it undergoes the least scattering by atmospheric particles like smoke or fog.Because it is scattered the least, red light can travel longer distances without being dispersed, making it clearly visible from far away.Therefore, the correct option is $A$.

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

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