Neco 2019 Geography Question 15
Practice objective / multiple choice question 15 from the 2019 Neco Geography examination.
A chemical plant releases a pollutant at a constant rate of \(Q = 500\) g·s\(^{-1}\). Under steady‑state conditions the ground‑level concentration \(C\) (in g·m\(^{-3}\)) at a downwind distance \(x\) (in km) is modelled by the Gaussian plume formula\n\n\[ C = \frac{Q}{\pi u \sigma^{2}} \]\n\nwhere the wind speed \(u = 2\) m·s\(^{-1}\) and the lateral dispersion parameter is \(\sigma = 0.3x\) km. The permissible exposure limit is \(L = 0.001\) g·m\(^{-3}\). Determine the minimum downwind distance \(x_{\min}\) (in km, to two decimal places) at which the concentration does not exceed the limit.
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About This Question
This is Neco 2019 Geography Question 15. It is one of the objective questions from the 2019 Neco Geography examination.
Difficulty level: Hard .
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