Question

The atmospheric concentrations of a gas depends on its emission into the atmosphere and its rates of physical, chemical and biological removal. the time to lower the concentration of the gas to _____ of its original amount is its atmospheric lifetime.

A. 37%
B. 73%
C. 27%
D. 72%

Answer 1

The atmospheric lifetime of a gas refers to the time it takes for the concentration of the gas to decrease to a certain fraction of its original amount. The correct answer is 37%. The correct option is A.

Step-by-step explanation:

The atmospheric lifetime of a gas refers to the time it takes for the concentration of the gas to decrease to a certain fraction of its original amount. The correct answer to the question is option A, 37%. To determine the atmospheric lifetime of a gas, you can use the formula t = T/ln(1 - f), where t is the atmospheric lifetime, T is the half-life of the gas, and f is the fraction of the original amount remaining.

For example, if the half-life of a gas is 10 years and you want to know the time it takes for the concentration to decrease to 37% of its original amount, you would calculate t = 10/ln(1 - 0.37) = 10/ln(0.63) ≈ 22.81 years.