Ankit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth's atmosphere as the earth's atmosphere is not evenly distributed and several observations can be explained on the basis of this phenomenon.
(A) Name the phenomenon about which Ankit remarked.
(B) Name two observations which can be explained by the above phenomenon.
(C) What is the total time difference on duration of day on earth?
(D) Why don't planets twinkle?
Answers
Answered by
4
Answer:
A) The phenomenon is Human Eye and Colourful world.
B) i. As sunlight travels to the earth atmosphere, it gets scatter by the atmospheric particles.
C) 24 hours.
D) Planets are not a source of light.
Answered by
5
The questions are answered below:
(A) The phenomenon about which Ankit remarked is named - atmospheric refraction.
(B) Two observations which can be explained by the above phenomenon of atmospheric refraction are -
- Twinkling of stars when observed from earth's surface
- Advance sunrise and delayed sunset
(C) The total time difference on duration of day on earth is four minutes. (This is because the earth takes twenty-three hours and fifty-six minutes to complete one rotation of 360 degrees.)
(D) Planets don't twinkle because:
- Planets are quite close to the earth in comparison to the stars.
- This is why planets can be considered as extended sources and planets can be taken as a collection of point sized light sources.
- Because of this, the light coming from these point sized sources will average to zero. Hence, planets do not twinkle.
Similar questions