Red colour is scattered the by fog or smoke because its wavelength is than the wavelength of other colour components of white light.

Correct option is D

The correct answer is (d) most, more.

• The red colour is scattered the least by fog or smoke because it has the longest wavelength among the visible colours.
• Due to its higher wavelength, red light is less affected by scattering, which is why it is used in traffic signals and warning lights.

Information Booster:
• Scattering of light is inversely proportional to the fourth power of wavelength (Rayleigh’s law).
• Violet and blue light scatter the most due to their short wavelength.
• Red light travels farther through fog, mist, and smoke — making it visible from a distance.

Additional Knowledge:
• Wavelength of red light: ~620–750 nm.
• Wavelength of violet light: ~380–450 nm.
• Hence, red light is least scattered and remains visible even in poor visibility conditions.