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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
What did Newton demonstrate by his experiments with the prism?
What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
We can see the sun before the actual sunrise by about:
(a) 5 minutes
(b) 2 minutes
(c) 2 hours
(d) 20 minutes
What colour does the sky appear to an astronaut?
What is tyndall effect? Explain with an example.
Which component of sunlight is scattered away when the sun appears red at sunrise or sunset?
In an experiment to study the scattering of light by passing a beam of white light through a colloidal solution of sulphur in a transparent glass tank:
Which colour is observed from the sides of the glass tank? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset?
What is the colour of the clear sky during day time? Give reason for it.
Twinkling of stars is due to atmospheric
What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each.
