Advertisements
Advertisements
प्रश्न
Explain why, when the sun is overhead at noon, it appears white, but when the same sun is near the horizon at sunset, it appears red.
Explain why the Sun appears white when it is overhead at noon, but the same Sun appears red when it is near the horizon at sunset.
Advertisements
उत्तर
When the sun is overhead at noon, sunlight has to travel a shorter distance through the earth's atmosphere to reach us. During this short journey of sunlight through the atmosphere, only a small amount of the blue light is scattered from the white light, keeping most of the white colour intact within it.
However, at sunset or sunrise, the sun appears red because it is near the horizon, and sunlight has to travel a relatively longer distance through the earth's atmosphere to reach us. During this long journey, most of the blue colour is scattered from our line of sight. Therefore, the light reaching our eyes consists of the colour red of sunlight, which is of longer wavelength and is scattered the least.
APPEARS IN
संबंधित प्रश्न
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.
Name some everyday objects:
which reflect all the colours in sunlight
We can see the sun before the actual sunrise by about:
(a) 5 minutes
(b) 2 minutes
(c) 2 hours
(d) 20 minutes
What happens when a beam of sunlight enters a dusty room through a window? Explain your answer.
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 colour of sky, in direction other than of the sun, is blue. Explain.
The clouds are seen white. Explain
Which colour of white light is scattered the least? Give reason.
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 ____________.
Why is the colour of the clear sky blue?
