Why is red colour selected for danger signal lights?

Options

A. it causes fear
B. it is as per international convention
C. it undergoes maximum scattering
D. it undergoes least scattering

Answer

D

Explanation

The light used in danger signals should be such that it should scatter less , while passing through the surrounding atmosphere . In the visible spectrum , red colour has the maximum wavelength . Hence the amount of scattered light is very small.
`(I prop (1)/(lambda^(4)))` Hence red light is used in danger signals.