Discussion
Two statements are given below, one is labelled as Assertion (A) and another labelled as Reason (R) :
Assertion (A) : Fog is the result of non-selective scattering of visible EMR.
Reason (R) : Atmospheric constituents larger than the EMR wavelength result in scattering of all visible rays.
Select the correct option from the codes given below :
Answer: A
The answer is both (A) and (R) are true and (R) is the correct explanation of (A).
Assertion (A) is correct: fog and clouds look white because they scatter all visible wavelengths about equally, which is non-selective scattering.
Reason (R) states the cause: non-selective scattering happens when the particles are much larger than the wavelength of the radiation, as fog droplets are compared with visible light. Smaller particles cause selective scattering instead (Rayleigh scattering by molecules, which makes the sky blue). Since (R) gives the reason fog scatters non-selectively, it explains (A).
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