The release of chlorofluorocarbons used in air conditioners and, to a lesser extent, in household sprays (hair spray, shaving cream, etc.) destroys the ozone in the upper atmosphere. At the present time, the amount of ozone, Q, is decaying exponentially at a continuous rate of 0.25% per year. How long will it take for 70% of the ozone to be destroyed? (Give your answer correct to three decimal places.)
2007-01-28 16:06:57 · 3 answers · asked by yassine 1 in Environment
The equation that you are looking for is (1-.0025)^y = .7 Solve for y to get the years. I get 142.492 years.
Did you want 3 decimal place accuracy or 3 significant digits? Not the same thing.
2007-01-28 16:23:43 · answer #1 · answered by rscanner 6 · 0⤊ 0⤋
Never. The question is impossible. Even though Chlorofluorocarbons have been released into the atmosphere, it became illegal and the Kyoto Protocol required that production of this chemical be fased out of in 2002 which it was. Now they are using a different type of fluorocarbons for freon and aerosol sprays. Also ozone is created each day by normal machinery. The ionic breeze releases ozone in small amounts by creating an electric charged grid that air flows over increasing O2 to O3. Ozone is also created in other ways in the stratosphere, but I can't recall right now. It has been shown in the past few years that the area with the least ozone (above antarctica) has actually reduced in size over the past few years.
2007-01-28 16:21:33 · answer #2 · answered by darlabbq 2 · 0⤊ 0⤋
it will come out to be near abt. 142.491 but it will not be be followed bcoz of changing levels due to decrease in the consumption of CFCs.
2007-01-28 16:48:37 · answer #3 · answered by divas 3 · 0⤊ 0⤋