Question

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.

Answer 1

rainbow

/ˈreɪnbəʊ/

noun

an arch of colours visible in the sky, caused by the refraction and dispersion of the sun's light by rain or other water droplets in the atmosphere. The colours of the rainbow are generally said to be red, orange, yellow, green, blue, indigo, and violet