Dobson units are used to measure thickness of:

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Question

Dobson units are used to measure thickness of:

Accepted Answer

Correct Answer: D — OzoneStep-by-step Solution:The Dobson Unit (DU) is the standard unit used to measure the total columnar amount of ozone in the atmosphere above a given point on Earth. One Dobson unit is defined as a layer of pure ozone 0.01 mm thick at standard temperature and pressure (STP). The global average ozone column is approximately 300 DU. A value below 220 DU indicates an ozone hole.Why other options are incorrect:A (Troposphere) and C (Stratosphere): Atmospheric layers are measured in terms of altitude (km), not Dobson units.B (CFCs): Chlorofluorocarbons are measured in parts per trillion (ppt) or parts per billion (ppb) by volume. CFCs are the primary cause of ozone depletion but are not measured in Dobson units.Key Concept: Dobson Unit = measurement of ozone column thickness. 1 DU = 0.01 mm thick layer of pure O₃ at STP. Normal ozone column = ~300 DU. Ozone hole threshold = below 220 DU.

Dobson units are used to measure thickness of:

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Dobson units are used to measure thickness of:

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