Discussion
Assertion (A) : According to Gaussian Plume Model, the downward concentration of pollutant appears to be inversely proportional to average wind speed at effective stack height.
Reason (R) : Plume rise does not depend on wind speed. It only depends on buoyancy flux parameter. Identify the correct answer :
Answer: C
(A) is true, but (R) is false.
In the Gaussian plume model the ground level concentration is inversely proportional to the mean wind speed at the effective stack height, so the Assertion is true. The Reason is false because plume rise does depend on wind speed, as well as on buoyancy flux, so (A) is true and (R) is false.
The other options, Both (A) and (R) are true and (R) is the correct explanation of (A).; Both (A) and (R) are correct and (R) is not the correct explanation of (A).; (A) is false, but (R) is true., are not the answer to this question. This agrees with the official final answer key for the paper, which gives option C.
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