Question

Assertion :Global warming (greenhouse effect) occurs due to the penetrability of low wavelength radiation through the ozone layer. Reason: CFC is a greenhouse gas, which results in the impenetrability of long wavelength radiation through CO${}_2$ of the atmosphere.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct and Reason is the not correct explanation for Assertion
  
• C. Assertion is correct and Reason is not the correct
  
• D. Assertion is not correct and Reason correct
  

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

• The greenhouse effect refers to circumstances, where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, but the longer wavelengths of the infrared re-radiation from the heated objects are unable to pass through that medium.
• The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.
• The greenhouse effect has been widely used to describe the trapping of excess heat by the rising concentration of carbon dioxide in the atmosphere.
• The carbon dioxide, methane, $N_{2}O$, ozone, CFC strongly absorbs infrared radiations other than any gas and does not allow as much of it to escape into space.

Thus, the correct answer is option A.