Advertisements
Advertisements
प्रश्न
Why does the sky appear dark (or black) to an astronaut instead of blue?
उत्तर
The sky appears dark (or black) to an astronaut instead of blue because there is no atmosphere containing air molecules in outer space to scatter sunlight.
संबंधित प्रश्न
Give the meaning of the term VIBGYOR. With which phenomenon is it connected?
How many colours are there in a full spectrum of white light? Write the various colours of spectrum in the order, starting with red.
Where in nature can you find evidence that white sunlight may be made of different colours?
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 red light makes the sky appear blue during the day time.
The red colour of the sun at the time of sunrise and sunset is because:
(a) red colour is least scattered
(b) blue colour is least scattered
(c) red colour is most scattered
(d) blue colour is most scattered
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
Complete the following statement:
When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ................ wavelength ................ light is able to reach us. Sunset is therefore ................
The colour of sky, in direction other than of the sun, is blue. Explain.
In white light of sun, maximum scattering by the air molecular present in the earth’s atmosphere is for ______.
Explain in brief the reason for the following :
Delayed sunset
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”.
Answer the following question:
Why is the Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.
At noon the sun appears white as:
The bluish colour of water in deep sea is due to ____________.
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each.
The colour of clear sky from the earth appears blue but from the space it appears black. Why?
