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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
Which color of white light is scattered the least and why?
Which colour of light has the shorter wavelength − red or violet?
How many colours are there in a full spectrum of white light? Write the various colours of spectrum in the order, starting with red.
What is tyndall effect? Explain with an example.
Which component of sunlight is scattered away when the sun appears red at sunrise or sunset?
The colour of sky, in direction other than of the sun, is blue. Explain.
Explain in brief the reason for the following :
Advanced sunrise
Name the point on the lens through which a ray of light passes undeviated.
Describe an experiment to show that “sunlight is essential for photosynthesis”.
The bluish colour of water in deep sea is due to ____________.
