EDUCATION UGC NET
ENVIRONMENTAL STUDIES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
0.1 m
|
|
|
0.01 m
|
|
|
0.1 mm
|
|
|
0.01 mm
|
Detailed explanation-1: -One Dobson Unit is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimeters thick at a temperature of 0 degrees Celsius and a pressure of 1 atmosphere (the air pressure at the surface of the Earth).
Detailed explanation-2: -Dobson unit (DU) A measure of atmospheric ozone: 1 Dobson unit is equivalent to 0.01 mm of ozone.
Detailed explanation-3: -One Dobson unit is the equivalent of 2.69 × 1016 molecules of ozone per square centimeter. Alternatively, 1 Dobson unit corresponds to a layer of ozone 10 m thick, if the ozone were held at standard temperature and pressure (273 K, 1 atm pressure). Copyright 2022 American Meteorological Society (AMS).
Detailed explanation-4: -1 Dobson Unit (DU) is: 2.6867 x 1020 molecules per meter square. 4.4615 x 10-4 mol/m. 2.1415 x 10-5 kg[O3]/m.
Detailed explanation-5: -The correct option is B thickness of ozone. Ozone is measured in what are called Dobson units. A Dobson unit of gas is equal to a layer of gas, at the surface of the Earth, with a thickness of one hundredth of a millimeter. The ozone in the atmosphere is about 300 Dobsons.