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ICSE Class 10 Physics Question 11 of 15

Spectrum — Question 3

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Question

Question 3

In the white light of Sun, maximum scattering by the air molecules present in the earth’s atmosphere is for —

  1. red colour
  2. yellow colour
  3. green colour
  4. blue colour
Answer

blue colour

Reason — Intensity of scattered light is found to be inversely proportional to the fourth power of the wavelength of light.

(i.e., I ∝ 1λ4\dfrac{1}{λ^4} ).

As blue light has lowest wavelength, hence, the blue light is scattered the most.