Question

Why is the colour of the ambulance siren red?

• A. Red colour is more catchy.
• B. Red colour is the colour of emergency.
• C. Red colour scatters less.
• D. Red light does not refract at all.

Answer 1

The correct option is C Red colour scatters less.

The smaller the wavelength more the scattering of light. Hence, in visible spectrum, the red light is the least scattered by the molecules present in the atmosphere. Hence, red light is used in the ambulance siren. Due to less scattering, it can travel farther distances and hence can be easily visible as compared to other colours.