Question

What is the residence time (average time a particle is active in a given system) of carbon monoxide?

(a) 11-15 years

(b) 0.1-0.3 years

(c) 0.5 years

(d) Few minutes

This question was addressed to me during an interview for a job.

Enquiry is from Air Pollution topic in chapter Air Pollution of Environmental Engineering

Answer 1

The correct answer is (b) 0.1-0.3 years

For explanation: The residence time is the average time a particle remains active in a given system.