why danger signals are red?

Asked by madhav aggarwal | 5th Mar, 2011, 12:00: AM

Expert Answer:

Dear student
A/c to Rayleigh's scattering, the scattering is inversely proportional to the fourth power of the wavelength. Now, the red light has maximum wavelength, so it is least scattered by fog or smoke. Therefore,
it can be seen in the same colour at a distance. Hence danger signals are in red.
Hope this clarifies your doubt.

Answered by  | 5th Mar, 2011, 09:56: AM

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