Discussion
A plume rise of \( 45 \) m is calculated at a wind speed of \( 4 \) m/s. If rise varies inversely with wind speed, at \( 8 \) m/s it becomes
Answer: D
Correct answer: 22.5 m
Plume rise varies inversely with wind speed, so doubling the wind halves the rise:
\[ \Delta h_2 = 45 \times \frac{4}{8} = 22.5\ \text{m} \]Physically, a stronger wind bends the plume over and carries it downwind before buoyancy can lift it.
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