Question

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 ____________.

Options

• is scattered the most by smoke or fog

• is scattered the least by smoke or fog

• is absorbed the most by smoke or fog

• moves fastest in air

Answer 1

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 is scattered the least by smoke or fog.

Explanation:

Red colour has a longer wavelength so least scattered by smoke or fog.