Advertisements
Advertisements
प्रश्न
The colour of clear sky from the earth appears blue but from the space it appears black. Why?
उत्तर
The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. These are more effective in scattering light of shorter wavelengths at the blue end than light of longer wavelengths at the red end. The red light has a wavelength about 1.8 times greater than blue light. Thus, when sunlight passes through the atmosphere, the fine particles in air scatter the blue colour (shorter wavelengths) more strongly than red. The scattered blue light enters our eyes. If the earth had no atmosphere, there would not have been any scattering. Then, the sky would have looked dark.
APPEARS IN
संबंधित प्रश्न
Why does sun appear red at sunrise and sunset?
What did Newton demonstrate by his experiments with the prism?
What is the order of colours in a rainbow, from the outside to the inside?
Which phenomenon makes us see the sun:
a few minutes after actual sunset?
State whether the following statements are true or false:
The scattering away of blue light makes the sun appear red at sunset.
Explain in brief the reason for the following :
Delayed sunset
Which colour of white light is scattered the least? Give reason.
The bluish colour of water in deep sea is due to ____________.
The clear sky appears blue because
Why is the colour of the clear sky blue?
