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Red is used as an emergency or danger signal as
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- it is a striking colour
- its wavelength is the longest
- it is scattered
- it has very high energy
- it is a striking colour
Correct Option: B
The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.
