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प्रश्न
Draw a labeled diagram to show
(i) the reddish appearance of the sun at the sunrise or the sunset and
(ii) white appearance of the sun at noon when it is overhead.
उत्तर
(i) The reddish appearance of the sun at sunrise or sunset is due to the scattering of light by the molecules of air and other fine particles in the atmosphere that have the size smaller than the wavelength of visible light from the sun near the horizon. Light travels larger distances at the horizon in the earth's atmosphere before reaching our eyes and most of the blue light and shorter wavelengths are scattered away by the particles. So, only red light, being of higher wavelength reaches us which gives the reddish appearance of the sun at sunrise or sunset.
(ii) At noon, the sun appears white, not red, as only a little of the blue and violet colors are scattered because light from the Sun overhead would travel a relatively shorter distance.
APPEARS IN
संबंधित प्रश्न
With the help of a labelled diagram, explain why the sun appears reddish at the sun-rise and the sun-set.
Name the scientist who discovered that sunlight consists of seven colours.
Which colour of the spectrum has
shortest wavelength?
Where in nature can you find evidence that white sunlight may be made of different colours?
Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to Illustrate your answer.
We can see the sun before the actual sunrise by about:
(a) 5 minutes
(b) 2 minutes
(c) 2 hours
(d) 20 minutes
State whether the following statements are true or false:
The scattering away of blue light makes the sun appear red at sunset.
Why are the 'danger signal' lights red in colour?
Explain in brief the reason for the following :
Delayed sunset
Why is the colour of the clear sky blue?
