The ozone layer in a particular region is slowly depleting at a continuous exponential rate of -0.2%. a) If the current layer strength is 94%, what will it be in 20 years? b) When will it become 80%?

Answer 1

A(t) = 0.94^-0.002t

A(20) = 0.94^-0.002(20)

0.80 = 0.94^-0.002t

ln 0.80 = -0.002(ln 0.94)t