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प्रश्न
Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason.
Why does the sky appear dark instead of blue to an astronaut?
The sky appears blue to an observer from the surface of the Earth. Explain its reason. How does the sky appear, during the day, to an astronaut staying in the international space station orbiting the Earth? State reason to justify your answer.
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उत्तर
Sunlight reaches the Earth's atmosphere and is scattered in all directions by the gases and particles in the air. Blue light is scattered more than the other colours because it has the shortest wavelength. This is why the sky appears blue to an observer from the surface of the Earth.
For an astronaut staying in the international space station orbiting the Earth, the colour of the sky will be black because the light reaching it does not scatter.
संबंधित प्रश्न
Name the scientist who discovered that sunlight consists of seven colours.
Which light has the longer wavelength : red light or blue light?
We can see the sun before the actual sunrise by about:
(a) 5 minutes
(b) 2 minutes
(c) 2 hours
(d) 20 minutes
Why does the sky appear dark (or black) to an astronaut instead of blue?
Why does the sun appear red at sunset?
The sky appears blue because some of the blue component of sunlight is scattered by:
(a) gas molecules present in air
(b) dust particles present in air
(c) water droplets suspended in air
(d) soot particles present in air
Explain why, when the sun is overhead at noon, it appears white, but when the same sun is near the horizon at sunset, it appears red.
What is the colour of the clear sky during day time? Give reason for it.
Why is the Tyndall effect shown by colloidal particles?
At noon the sun appears white as:
