Discussion
Statement I: Ground level concentration is proportional to wind speed.
Statement II: A faster wind carries the same emission over a greater distance in the same time.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect: ground level concentration is inversely proportional to wind speed, not proportional to it. The wind speed appears in the denominator of the Gaussian plume equation, so a faster wind gives a lower concentration.
Statement II is correct, and it is the reason the first is wrong. A faster wind carries the same emission over a greater distance in the same time, so the material is spread through a larger volume of air and diluted in proportion. The two statements together are a common trap: a true mechanism paired with a relation stated the wrong way round.
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