Why are the danger signals coloured red?

Because red light scatters the least

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Because red light undergoes total internal reflection

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Because red light scatters the most

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None of these

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Solution

The correct option is A
Because red light scatters the least

The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color.

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Similar questions

Q. The signal light for danger is red in colour. Which of the following principle/ principles is/are used in it?

(P)

The red coloured light scatters least by fog or smoke.

(Q)

The wavelength of red coloured light is about

1.8

times more than that of blue.

Question 9
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

(a) is scattered the most by smoke or fog
(b) is scattered the least by smoke or fog
(c) is absorbed the most by smoke or fog
(d) moves fastest in air

Q. Sun appears to be red during sunset and sunrise because blue light scatters more than red light in atmosphere. (Yes/No)

Q. The sky appears red at sunrise and sunset. Because the red light scatters less and enter our eyes.

Q. Why does red light scatter the least?

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Why are the danger signals coloured red?

The correct option is A Because red light scatters the least The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color.

The correct option is A
Because red light scatters the least

The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color.