Do Greenhouse gases absorb only Infrared or a a range of wavelengths ?
Please specify the range of wavelength of radiations. Infrared radiations are of order 10^-5 so they should be considered shorter. Right ? Anyhow, The exact question is as follows
Q. Methane is a Greenhouse Gas because-
A) it absorbs longer wavelenghts of the electromagnetic spectrum while transmitting shorter wavelenghts
B) it absorbs shorter wavelenghts of the electromagnetic spectrum while transmitting longer wavelenghts
C) it absorbs all wavelenghts of the electromagnetic radiation
D) it transmits all wavelenghts of the electromagnetic radiation

Thanks in Advance

2

Answers

2015-11-08T21:14:25+05:30

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Green house gases absorb only Long waves which have very large wavelengths. So yes, they absorb mostly infrared rays only. They do not absorb short waves.

The range of wavelengths of infrared rays is 700nm(7×10⁻⁷m) to 1mm(10⁻³m). In electromagnetic spectrum, these wavelengths are not considered as short wavelengths. Short wavelengths are in the order of 10⁻¹°m 

The answer is A.
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2015-11-09T18:43:37+05:30

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The Green houses gases are  CO2,  chlorofluoro carbons, CFC,  Methane CH4,  sulfur related gases, even water vapour in air etc.  

They absorb light energy (photons) of longer wavelength and shorter frequency than light.  Because the energy gaps for the outer most orbit electrons in the shells correspond to these frequencies of photons.   So these gases transmit the visible light and ultraviolet rays.

Infrared  radiation starts from 800 nm to 100 micro meters.  But green house gases may not absorb the radiations in the entire infrared spectrum.

For ozone, the  energy bands correspond to ultraviolet rays frequencies.  So they absorb them. 

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