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प्रश्न
Why does the sun appear red at sunrises and sunset?
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.
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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.
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 is the colour of the sunlight scattered by the air molecules in the atmosphere?
Which of the two is scattered more easily, light of shorter wavelengths or light of longer wavelengths?
State whether the following statements are true or false:
The scattering away of blue light makes the sun appear red at 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?
Complete the following statement:
When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ................ wavelength ................ light is able to reach us. Sunset is therefore ................
What is meant by advance sunrise and delayed sunset? Draw a labelled diagram to explain these phenomena.
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
