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Question
Why does the sun appear red at sunrises and sunset?
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Solution
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.
RELATED QUESTIONS
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?
Name the scientist who discovered that sunlight consists of seven colours.
Which phenomenon makes us see the sun:
a few minutes before actual sunrise?
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Out of blue light and red light, which one is scattered more easily?
The red colour of the sun at the time of sunrise and sunset is because:
(a) red colour is least scattered
(b) blue colour is least scattered
(c) red colour is most scattered
(d) blue colour is most scattered
In white light of sun, maximum scattering by the air molecular present in the earth’s atmosphere is for ______.
A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered the most.
The clear sky appears blue because:
