Question: 97 The thickness of ozone in a column of air in the atmosphere is measured in terms of :
(1) Decameter
(2) Kilobase
(3) Dobson units
(4) Decibels
Answer: Option (3)
Explanation:
The amount or thickness of ozone present in a vertical column of the atmosphere is expressed using a standard unit.
This unit is called the Dobson unit.
Dobson units represent the total quantity of ozone compressed into a layer at standard temperature and pressure.
This measurement is commonly used to monitor ozone concentration and ozone layer depletion.
Hence, the correct answer is Option (3).