Discussion
Assertion (A): Concentration in a Gaussian plume is inversely proportional to wind speed.
Reason (R): A faster wind distributes the same emission over a greater length of plume in a given time.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the assertion. Concentration in a Gaussian plume is inversely proportional to wind speed, with \( u \) appearing once in the denominator of \( C = \dfrac{Q}{2\pi u \sigma_y \sigma_z}\exp(\cdot) \).
The reason gives the physical basis: a faster wind distributes the same emission over a greater length of plume in a given time, so the mass per unit volume falls in proportion. Doubling the wind speed therefore halves the concentration - a first-power relation, not a square.
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