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प्रश्न
With the help of a labelled diagram, explain why the sun appears reddish at the sun-rise and the sun-set.
उत्तर
At sunrise and sunset, the Sun is near the horizon and its rays cover a larger part of the atmosphere. As the intensity of the scattered light is inversely proportional to the wavelength of the colour, therefore, most of the blue light and other components of shorter wavelength are scattered away by the particles. The wavelength of the red colour is the longest among all the components of white light; therefore, it is least scattered and appears to come from the sun. Hence, the Sun looks red at the time of sunrise and sunset.
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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.
Which colour of the spectrum has
longest wavelength,
Which light has the longer wavelength : red light or blue light?
Which colour of light has the shorter wavelength − red or violet?
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 happens when a beam of sunlight enters a dusty room through a window? Explain your answer.
Draw a neat and labelled diagram of the experimental set up for observing the scattering of light in a colloidal solution of sulphur to show how the sky appears blue, and the sun appears red at sunrise and sunset.
When sunlight enters the earth’s atmosphere, state which colour of light is scattered
- the most and
- which the least.
State the difference in colours of the sun observed during sunrise/sunset and noon. Give explanation for each.
Blue colour of sky is due to the phenomenon of
