Why are danger signals Red Coloured

Human eye is most sensitive to red colour

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Red light is scattered most by the atmosphere

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Red light is scattered least by the atmosphere

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Red is a terrifying colour

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Solution

The correct option is B Red light is scattered least by the atmosphere
The red colour has the longest wavelength. So it scatters least by the particles in the atmosphere. Since red light is scattered least by the atmosphere, red is visible from large distances and is thus used for danger signals.

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Similar questions

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. Which colour of light is scattered the most (maximum) in the atmosphere?

When sunlight enters the earth's atmosphere, state which colour of light is scattered (i) the most, and (ii) the least.

Question 4
At noon the sun appears white as

(a) light is least scattered
(b) all the colours of the white light are scattered away
(c) blue colour is scattered the most
(d) red colour is scattered the most

Q. Eye is more sensitive to yellow color. Why are then danger signals red?

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Why are danger signals Red Coloured

The correct option is B Red light is scattered least by the atmosphereThe red colour has the longest wavelength. So it scatters least by the particles in the atmosphere. Since red light is scattered least by the atmosphere, red is visible from large distances and is thus used for danger signals.

The correct option is B Red light is scattered least by the atmosphere
The red colour has the longest wavelength. So it scatters least by the particles in the atmosphere. Since red light is scattered least by the atmosphere, red is visible from large distances and is thus used for danger signals.