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प्रश्न
Why are the 'danger signal' lights red in colour?
उत्तर
Danger signal lights are red because this colour has the longest wavelength among all the colours. Also, it is the least scattered by fog, dust and smoke particles. This makes red light visible even from a longer distance.
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संबंधित प्रश्न
Which colour of the spectrum has
shortest wavelength?
What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
Which of the two is scattered more easily, light of shorter wavelengths or light of longer wavelengths?
Which effect is illustrated by the observation that when a beam of sunlight enters a dusty room, then its path becomes visible to us.
The red colour of the sun at the time of sunrise and sunset is because:
(a) red colour is least scattered
(b) blue colour is least scattered
(c) red colour is most scattered
(d) blue colour is most scattered
The sky appears blue because some of the blue component of sunlight is scattered by:
(a) gas molecules present in air
(b) dust particles present in air
(c) water droplets suspended in air
(d) soot particles present in air
The danger signal is red. Why?
The colour of sky, in direction other than of the sun, is blue. Explain.
Which colour of white light is scattered the least? Give reason.
The colour of clear sky from the earth appears blue but from the space it appears black. Why?
