Physics
The danger signal is red. Why?
Spectrum
43 Likes
Answer
In the visible light, the wavelength of red light is longest, therefore the light of red colour is scattered least by the air molecules of the atmosphere.
Hence, the light of red colour as compared to the light of other colours can penetrate to a longer distance without becoming weak.
Thus, red light can be seen from the farthest distance in comparison to the light of other colours having the same intensity.
Hence red light is used for danger signal, so that the signal may be visible from the far distance even in fog, etc.
Answered By
27 Likes
Related Questions
How does the intensity of scattered light depend on the wavelength of incident light? State the condition when this dependence hold.
Which colour of white light is scattered the least? Give reason.
How would the sky appear when seen from the space (or moon)? Give reason for your answer.
What characteristic property of light is responsible for the blue colour of the sky?