Question

Danger signals uses red light in preference to other colors of light because of following reasons:

• A. Red light has least scattering property
• B. Red light scatters the most
• C. Red light has least wavelength
• D. Red light has highest wavelength

Answer 1

Answer: (A), (D)

The correct options are
A Red light has least scattering property
D Red light has highest wavelength

The effect of scattering is inversely proportional to the wavelength of light. Red light has highest wavelength and hence it scatters the least. So red light is able to travel long distances, due to which it is used as a danger signal.