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Q.

Is it true that the danger signal is light red in colour?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
Red warning signals are used because red light is least scattered by air, water, and dust molecules. Red is the least diffused colour and has the longest wavelength of all the colours. Because air molecules disperse red the least, red is the colour chosen for hazard signals. The wavelength of a color's fourth power and the scattering effect are inversely related.[1][2] Mathematically,

the amount of scattering = \frac{1}{λ^{4}}

Where,

λ

is the wavelength of colour.
Red has the highest wavelength of all the colours, making it the colour that scatters the least.

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