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प्रश्न
Why does the sun appear red at sunrises and sunset?
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उत्तर
At the time of sunrise and sunset, the light from sun has to travel the longest distance of atmosphere to reach the observer. The light travelling from the sun loses blue light of short wavelength due to scattering, while the red light of long wavelength is scattered a little, so is not lost much. Thus blue light is almost absent in sunlight reaching the observer, while it is rich in red colour.
संबंधित प्रश्न
What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the Sun appears reddish at sunrise.
What information do we get about sunlight from the formation of a rainbow?
What colours make up white light?
What is the order of colours in a rainbow, from the outside to the inside?
Which light has the longer wavelength : red light or blue light?
What colour does the sky appear to an astronaut?
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?
To an astronaut in a space-ship, the earth appears ______.
Why is the Tyndall effect shown by colloidal particles?
The clear sky appears blue because:
