Dobson units are used to quantify

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the amount of oxygen required by microbes to decompose organic matter in water

the amount of ozone in a vertical column of Earth’s atmosphere

the sedimentation rate of macromolecules in a centrifuge

the intensity of noise relative to the threshold of human hearing

answer is B.

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Detailed Solution

Dobson Units (DU) is a unit of measurement used to quantify the total amount of ozone in a vertical column of the Earth's atmosphere. It is named after G.M.B Dobson, a British physicist who was a pioneer in the development of atmospheric ozone measurements.
One Dobson Unit (DU) is defined as the amount of ozone that would be required to create a layer of pure ozone that is 0.01 millimetres thick at a temperature of 0 degrees Celsius and a pressure of 1 atmosphere.
The intensity of noise relative to the threshold of human hearing is measured in decibels.
The sedimentation rate of macromolecules in a centrifuge is measured in Svedberg units.
The amount of oxygen required by microbes to decompose organic matter in water is termed BOD and is typically measured in units of mg/L or ppm.

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