Waec Model Questions Vol1 2018 Geography Question 3
Practice objective / multiple choice question 3 from the 2018 Waec Model Questions Vol1 Geography examination.
Leachate from a landfill contaminates groundwater. The concentration at a distance \(x\) km from the landfill follows \(C = C_0 e^{-kx}\) where \(C_0 = 120\) mg L⁻¹ and \(k = 0.8\) km⁻¹. The permissible limit for drinking water is 10 mg L⁻¹. A community well is located somewhere between 0.5 km and 2 km from the landfill. (a) Find the minimum distance the well must be from the landfill to meet the limit. (b) If a treatment plant reduces the concentration by 40 % before consumption, what is the new minimum distance? State whether either distance lies within the 0.5-2 km range.
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About This Question
This is Waec Model Questions Vol1 2018 Geography Question 3. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Geography examination.
Difficulty level: Hard .
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