Question

The expression of relative stability at 20^oC is given by ___________

(a) S = (1-(0.794)^T20)

(b) S = 100 (1-(0.794)^T20)

(c) S = 1-(0.794)^T20

(d) S = 100 (0.794)^T20

I have been asked this question during a job interview.

Enquiry is from Population Equivalent and Relative Stability topic in portion Wastewater Characteristics of Environmental Engineering

Answer 1

Correct choice is (b) S = 100 (1-(0.794)^T20)

Best explanation: The expression of relative stability at 20^oC is given by

S=100 (1-(0.794)^T20) where T20 represents the incubation period at 20^oC.