Very Short Answer
1. Name the phenomenon which causes the twinkling of stars.
2. Name two effects produced by the atmospheric refraction
3. Which phenomenon makes us see the sun :
(a) a few minutes before actual sunrise ?
(b) a few minutes after actual sunset?
4. Atmospheric refraction causes advance sunrise and delayed sunset. By how much time is
(a) sunrise advanced ?
(b) sunset delayed?
5. State whether the following statement is true or false
The planets twinkle at night due to atmospheric refraction of light.
6. Name the phenomenon due to which the stars seem higher in the sky than they actually are
7. Fill in the following blanks with suitable words:
We can see the sun about.............minutes before the actual sunrise and about. minutes after the actual
sunset because of atmospheric.....
Answers
Answer:
1.
atmospheric refraction
3part a and b are both due to atmospheric refraction
4 it takes 2 mins. in both
6
it is due to refraction of light
5 false
7 2min., refraction
Answer:
1.In simple terms, twinkling of stars is caused by the passing of light through different layers of a turbulent atmosphere.
2.The twinkling of stars is produced by atmospheric refraction. (b) Advanced sunrise and delayed sunset are also effects produced by atmospheric refraction.
3.(a)Refraction
(b)Refraction
4.(a)To sum up, due to refraction we see the sun rise about two minutes before it's actually there and during sunset we see it for around two minutes more, even though it has already moved from that position.
(b)Advanced sunrise and delayed sunset are phenomena caused due to atmospheric refraction. In this the Sun appears to rise early by 2 minutes and set late by 2 minutes.
5.False. The planets do not twinkle at all because of the atmospheric refraction of light. As the planets are large bodies and very close to the earth, the continuously changing atmosphere cannot cause much deviations in the light coming from the planets.
6.atmospheric refraction