Igcse Model Questions Vol1 2018 Biology Question 20
Practice objective / multiple choice question 20 from the 2018 Igcse Model Questions Vol1 Biology examination.
A bacterial suspension has an initial concentration of \(1.0 \times 10^{6}\) CFU ml\(^{-1}\). An antibiotic at concentration \(C\) µg ml\(^{-1}\) reduces the population according to \(N = N_{0} e^{-k t}\) where \(k = 0.05 C\) h\(^{-1}\). If the antibiotic is applied at \(20\) µg ml\(^{-1}\), after how many hours will the concentration fall below \(1.0 \times 10^{2}\) CFU ml\(^{-1}\)? Give your answer to one decimal place.
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This is Igcse Model Questions Vol1 2018 Biology Question 20. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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