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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.
उत्तर
At the time of sunrise and sunset, when the Sun is near the horizon, sunlight travels a greater distance through the atmosphere to reach us. During this time, most of the shorter wavelengths present in it are scattered away from our line of sight by the molecules of air and other fine particles in the atmosphere. So, light reaching us directly from the rising or setting Sun consists mainly of the longer wavelength red colour because of which the Sun appears red. Thus, at sunrise and sunset, the Sun and the surrounding sky appear red.
At noon, the Sun is overhead. So, the sunlight has to travel a relatively shorter distance. Hence, there is only slight scattering of shorter wavelengths of blue and violet colour. Therefore, the Sun appears mostly white.
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संबंधित प्रश्न
Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason.
Name the scientist who discovered that sunlight consists of seven colours.
Name some everyday objects:
which absorb all the colours in sunlight
Which phenomenon makes us see the sun:
a few minutes after actual sunset?
Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to Illustrate your answer.
Sunset is red because at that time the light coming from the sun has to travel:
(a) lesser thickness of earth's atmosphere
(b) greater thickness of earth's atmosphere
(c) varying thickness of earth's atmosphere
(d) along the horizon
What characteristic property of light is responsible for the blue colour of the sky?
Using the phenomenon of scattering of light, explain why there is a difference in the colour of the sun as it appears during sunrise and at noon.
A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered the most.
Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.
