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Q: Why does sky appear blue?
  • A. All colors of white light, except blue, are most strongly engraved by air molecules.
  • B. The light of all colors is in the correct proportion.
  • C. Blue wavelength is relatively low as white light and it is most scattered by air molecules.
  • D. White light is reflected by all the air molecules.
Correct Answer: Option C - When a white light (from sun) enters the earth atmosphere, it gets scattered away due to the atmospheric particles. Since, blue colour has the minimum wavelength, so blue colour scatters the most and thus the sky appears blue.
C. When a white light (from sun) enters the earth atmosphere, it gets scattered away due to the atmospheric particles. Since, blue colour has the minimum wavelength, so blue colour scatters the most and thus the sky appears blue.

Explanations:

When a white light (from sun) enters the earth atmosphere, it gets scattered away due to the atmospheric particles. Since, blue colour has the minimum wavelength, so blue colour scatters the most and thus the sky appears blue.