Discussion
Statement I: Plume rise falls as wind speed increases.
Statement II: A stronger wind bends the plume over and carries it away before it can rise.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Statement II gives the mechanism for statement I. A stronger wind bends the plume over and carries it downwind before buoyancy has time to lift it, so rise falls roughly as \(1/u\). This is why the worst ground-level concentrations often occur in moderate rather than light winds: the loss of plume rise outweighs the extra dilution.
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