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Why is the colour red used as a sign of ...

Why is the colour red used as a sign of danger ?

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When the light passes through atmosphere, it gets scattered by small air particles. The scattering of light is inversely proportional to the fourth power of its wavelength. As the red light has the highest wavelength among all the colours, so it is scattered the least. That's why it can travel through longer distance.
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ICSE-SPECTRUM-EXERCISE C
  1. A beam of blue, green and yellow light passes through the earth's atmo...

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  2. In the atmosphere which colour of light gets scattered the least ?

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  3. Why is the colour red used as a sign of danger ?

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  4. How would the sky appear when seen from the space (or moon)? Give reas...

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  5. Which characteristic property of light is responsible for the blue col...

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  6. The colour of sky, in direction other than of the Sun, is blue. Explai...

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  7. (i) Why does the sun appear reddish at sun-set or sun- rise ? (ii) F...

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  8. The sky at noon appears white. Give reason.

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  9. Give reasons for the following: During the day : Clouds appear whi...

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  10. Give reason why the smoke from a fire looks white.

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  11. What is meant by scattering of light?

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  12. How does the intensity of scattered light depend onthe wavelength of i...

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  13. When sunlight enters the earth's atmosphere, state which colour of lig...

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  14. A beam of blue, green and yellow light passes through the earth's atmo...

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  15. In the atmosphere which colour of light gets scattered the least ?

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  16. Why is the colour red used as a sign of danger ?

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  17. How would the sky appear when seen from the space (or moon)? Give reas...

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  18. Which characteristic property of light is responsible for the blue col...

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  19. The colour of sky, in direction other than of the Sun, is blue. Explai...

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  20. (i) Why does the sun appear reddish at sun-set or sun- rise ? (ii) F...

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