1. Why do stars twinkle and hence why do planets do not twinkle?
2. Give reason for the following: (a) Blue colour of the sky (b) Red colour of danger signals.
3. Give reason for the following (a) White colour of clouds (b) Sun appears red at the time of sun set and sun rise.
4. Explain Tyndal Effect.
5. What is rainbow? Give the conditions for observing it. State the principle involved in the formation of rainbow.
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Ans 1)
The stars twinkle because the light coming from the stars keeps on changing before actually reaching our eyes. The Rays coming from the distinct stars constantly undergoes multiple atmospheric refraction, and the atmosphere also keeps on changing due to heating effect of the sun and other natural phenomenon so the light reaching our eyes also keeps on changing.
The planets don't twinkle because they don't have their source of light. They can only reflect the part of light falling on them due to stars.
Ans 1)
The stars twinkle because the light coming from the stars keeps on changing before actually reaching our eyes. The Rays coming from the distinct stars constantly undergoes multiple atmospheric refraction, and the atmosphere also keeps on changing due to heating effect of the sun and other natural phenomenon so the light reaching our eyes also keeps on changing.
The planets don't twinkle because they don't have their source of light. They can only reflect the part of light falling on them due to stars.