Q106
General SciencePhysics
Twinkling of stars is on account of
- a.large distance of stars and storms in air
- b.rotation of earth
- c.large size of earth
- d.large distance of stars and fluctuations in the density of air
Answer: (D) large distance of stars and fluctuations in the density of air
Stars are so distant that they behave as point sources of light; as their light passes through Earth's atmosphere, continuously shifting pockets of air with varying density and temperature refract it unevenly, causing the apparent flickering or "twinkling" we observe (a phenomenon called stellar scintillation).