1. The number density of ozone at z = 20km altitude is nO3 = 5.2 x 1012 molecules cm-3. What thickness of this air absorbs 99% of incoming 280nm radiation? The ozone absorption cross section peaks at 280 nm with a value of σO3 = 2.00 x 10-18 cm2 molecule-1. Assume ozone is the only species that absorbs this radiation, and answer in km with two significant digits.
1. The number density of ozone at z = 20km altitude is nO3 = 5.2 x...