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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.
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संबंधित प्रश्न
Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.
Which colour of the spectrum has
shortest wavelength?
Name some everyday objects:
which reflect all the colours in sunlight
Which phenomenon makes us see the sun:
a few minutes before actual sunrise?
Name the phenomenon due to which the stars seem higher in the sky than they actually are.
Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to Illustrate your answer.
What characteristic property of light is responsible for the blue colour of the sky?
What is the colour of the clear sky during day time? Give reason for it.
The clear sky appears blue because:
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
