(B) The thickness of the ozone layer in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units $(DU)$.One D

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(B) The thickness of the ozone layer in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units $(DU)$.One Dobson unit is the thickness of $0.01 \ mm$ of ozone at standard temperature and pressure $(STP)$.Decibels $(dB)$ are used to measure the intensity of sound,not the thickness of ozone.