Question

Ozone is formed in the upper atmosphere by a photochemical reaction with:

• A. {Ultra violet solar radiation}
• B. {Infra red radiation}
• C. {Visible light}
• D. {All of the above}

Hint:

The ozone layer absorbs harmful UV radiation and protects living organisms from its effects.

Answer 1

The Correct Option is A

Step 1: Ozone formation in the upper atmosphere occurs through the Chapman cycle, where oxygen molecules absorb ultraviolet (UV) radiation. Step 2: The reaction process: \[ O_2 + hv \rightarrow 2O \quad {(UV radiation splits oxygen molecules)} \] \[ O + O_2 \rightarrow O_3 \quad {(Ozone formation)} \] Step 3: Infrared and visible light do not contribute significantly to ozone formation. Thus, the correct answer is (A) Ultra violet solar radiation.