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Why are the 'danger signal' lights red i...

Why are the 'danger signal' lights red in colour ?

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Out of the various colours of the white light, eye is very sensitive to red colour. Even if the red colour is comparatively less intense, it affects the eye and can detect even in pitch dark night. Therefore, signals with red colour convey quickly that danger is ahead and steps should be taken to avert that danger.
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Knowledge Check

  • The danger signals are red in colour because it is :

    A
    strongly scattered by fog or smoke
    B
    least scattered by fog or smoke
    C
    least obsorbed by fog or smoke
    D
    strongly absorbed by fog or smoke
  • Why does the surface of the planet Mars appear red in colour?

    A
    Presence of acids in its atmosphere
    B
    Presence of iron oxide on its surface
    C
    Presence of dust particles in its atmosphere
    D
    Presence of water on its surface
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