Advertisements
Advertisements
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.
Advertisements
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
Why does sun appear red at sunrise and sunset?
What did Newton demonstrate by his experiments with the prism?
Which of the two is scattered more easily, light of shorter wavelengths or light of longer wavelengths?
How would the sky appear when seen from the space (or moon)? Give reason for your answer.
Explain in brief the reason for the following:
Twinkling of stars
What is meant by advance sunrise and delayed sunset? Draw a labelled diagram to explain these phenomena.
Describe an experiment to show that “sunlight is essential for photosynthesis”.
To an astronaut in a space-ship, the earth appears ______.
The bluish colour of water in deep sea is due to ____________.
How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
