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प्रश्न
The danger signal is red. Why?
उत्तर
Since the wavelength of red light is the longest in the visible light, the light of red colour is scattered the least by the air molecules of the atmosphere and therefore the light of red colour can penetrate to a longer distance. Thus red light can be seen from the farthest distance as compared to other colours of same intensity. Hence it is used for danger signal so that the signal may be visible from the far distance.
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संबंधित प्रश्न
With the help of scattering of light, explain the reason for the difference in colours of the Sun as it appears during sunset/sunrise and noon.
Why does the sun seem to rise two minutes before the actual sunrise and set two minutes after the actual sunset ? Explain with the help of labelled diagram.
What colours lie on the two sides of the 'green colour' in the spectrum of white light?
Which phenomenon makes us see the sun:
a few minutes before actual sunrise?
State whether the following statements are true or false:
The scattering away of red light makes the sky appear blue during the day time.
What colour does the sky appear to an astronaut?
Which component of sunlight is scattered away when the sun appears red at sunrise or sunset?
When sunlight enters the earth’s atmosphere, state which colour of light is scattered
- the most and
- which the least.
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
Blue colour of sky is due to the phenomenon of
