The thickness of ozone in a column of air in the atmosphere is measured in terms of:

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Question

The thickness of ozone in a column of air in the atmosphere is measured in terms of:

Accepted Answer

Correct Answer: D — Dobson unitsStep-by-step Solution:The thickness of the ozone layer in a vertical column of the atmosphere is measured in Dobson units (DU), named after G.M.B. Dobson, who first measured atmospheric ozone. One Dobson unit is defined as the thickness of the ozone layer that would result if all the ozone in a column were compressed to standard temperature and pressure (STP) — 1 DU = 0.01 mm thickness of pure ozone at STP. The normal thickness of the ozone layer is about 300 DU. The ozone hole over Antarctica showed values dropping below 200 DU (sometimes to 100 DU).Why other options are incorrect: Decibels (A) measure sound intensity. Decameter (B) is a unit of length (10 metres) — it is not used for measuring ozone column thickness. Kilobase (C) is a unit of DNA/RNA length (1 kb = 1000 base pairs) used in molecular biology.Key Concepts:Dobson unit (DU): Unit of measurement for atmospheric ozone concentration. 1 DU = 0.01 mm of pure ozone at STP.Normal ozone layer thickness ≈ 300 DU; ozone hole values Ozone is present in the stratosphere (15–50 km altitude); absorbs harmful UV-B and UV-C radiation.Depletion is caused by CFCs (chlorofluorocarbons), which release Cl radicals that catalytically destroy ozone.Montreal Protocol (1987): International agreement to phase out ozone-depleting substances.

The thickness of ozone in a column of air in the atmosphere is measured in terms of:

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The thickness of ozone in a column of air in the atmosphere is measured in terms of:

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