Civil Engineering - UPSC Civil Service Exam Questions - Discussion


Which type of light energy is effectively absorbed by CO2 in the lower boundary of the troposphere ?

[A]. X - rays
[B]. UV - rays
[C]. Visible light
[D]. Infra-red rays

Answer: Option D


No answer description available for this question.

Harshida said: (Jul 15, 2014)  
Light energy in the form of visible light, UV reaches the earths surface which is re radiated with a greater wavelength in the form of IR radiation and it is absorbed by CO2, Which is the main cause of global warming.

Vivek said: (Oct 20, 2014)  
Infra red is the only above mentioned rays having power to vibrate Co2. That's the only reason.

Gnana Kumar said: (Sep 10, 2015)  
Why UV not absorb the carbon dioxide?

Raghavendra said: (Sep 15, 2015)  
What is the reason? How?

Sani Chavan said: (Sep 19, 2015)  
Wavelength of light is 300000000. So in troposphere there is O2 is present, presence of O2 CO2 absorbing.

G.Lokesh said: (Nov 18, 2015)  
What is the reason the infra red rays only vibrate?

Pradee said: (Aug 16, 2017)  
Infra is one of most power.

Pranita Chandanshive said: (Aug 2, 2018)  
CO2 is major greenhouse gas and absorbs light energy of greater wavelength like infrared radiation. When light energy is absorbed it gets converted into heat or thermal energy. As we move towards upper layers in the troposphere, temperature goes on decreasing and air becomes cooler. It expands due to decrease in pressure.

Nilkamal Mahadani said: (Oct 8, 2018)  
Infra red rays have high wave length & when it is reflected, co2 gases absorbed this. So the answer is D.

Anil said: (Sep 16, 2019)  
Infra-red-rays have high wavelength.

Drashti Solanki said: (Mar 12, 2021)  
Uv - rays may not Sufficient to absorb co2?

G.Jaswanth said: (Jul 1, 2021)  
Infrared rays are effectively absorbed in the lower boundary of the troposphere. Because it has a greater wavelength. And co2 is a greenhouse gas.

So, the right answer is (D).

Viraj said: (Sep 27, 2021)  
Yes, D is correct because of the greater wave length.

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