Which layer of the Earth's atmosphere is primarily responsible for absorbing ultraviolet radiation from the Sun?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2: Stratosphere
Detailed Analysis & SolutionThe Earth's atmosphere is divided into several layers based on temperature changes. Each layer serves a specific protective function.
The Stratosphere and Ozone: The Stratosphere extends from about 12 km to 50 km above the Earth's surface. Within this layer lies the Ozone Layer (concentrated between 15–35 km).
Absorption Mechanism: Ozone ($O_3$) molecules are highly effective at absorbing Ultraviolet (UV) radiation, particularly UV-B and UV-C rays. Without this absorption, these high-energy rays would reach the surface, causing skin cancer, cataracts, and damage to marine ecosystems.
Temperature Inversion: Unlike the Troposphere (where it gets colder as you go up), the Stratosphere actually gets warmer with altitude. This is because the absorption of UV radiation by ozone releases heat.
Important Key Facts for Competitive ExamsPotential Competition QuestionsQ1. In which layer of the atmosphere do most commercial jet aircraft fly to avoid weather turbulence?
Answer: Stratosphere
Q2. The depletion of the Ozone layer is primarily caused by which class of chemicals?
Answer: Chlorofluorocarbons (CFCs)