Ans. See Sample Problem on page 269 of this book.
Q.10. Why do stars twinkle ?
Ans See nare 290 of this book
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Answer:
As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star's appearance to wobble or twinkle
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stars looks twinkling due to atmosphere present on the earth . the air
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