The ultraviolet spectrum can be divided into three regionsbased on wavelength: UV-A (315–400 nm), UV-B (280–315nm), and UV-C (100–280 nm). (a) Photons from whichregion have the highest energy and therefore are the mostharmful to living tissue? (b) In the absence of ozone, whichof these three regions, if any, are absorbed by the atmosphere?(c) When appropriate concentrations of ozone arepresent in the stratosphere, is all of the UV light absorbedbefore reaching the Earth’s surface? If not, which region orregions are not filtered out?

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter20: Molecular Spectroscopy And Photochemistry
Section: Chapter Questions
Problem 49P
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The ultraviolet spectrum can be divided into three regions
based on wavelength: UV-A (315–400 nm), UV-B (280–315
nm), and UV-C (100–280 nm). (a) Photons from which
region have the highest energy and therefore are the most
harmful to living tissue? (b) In the absence of ozone, which
of these three regions, if any, are absorbed by the atmosphere?
(c) When appropriate concentrations of ozone are
present in the stratosphere, is all of the UV light absorbed
before reaching the Earth’s surface? If not, which region or
regions are not filtered out?

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