Methane is a greenhouse gas because - Vidyadip

MCQ

Methane is a greenhouse gas because

✓
it absorbs longer wavelengths of the electromagnetic spectrum while transmitting shorter wavelengths
B
it absorbs shorter wavelengths of the electromagnetic spectrum while transmitting longer wavelengths
C
it absorbs all wavelengths of the electromagnetic spectrum
D
it transmits all wavelengths of the electromagnetic spectrum

✓

Answer

Correct option: A.

it absorbs longer wavelengths of the electromagnetic spectrum while transmitting shorter wavelengths

a
(a)

Heat through sun reaches earth in form of infrared radiations of higher frequency range approx $10^{14} \,Hz$. This heat is absorbed by solids on earth's surface and they re-radiate this heat in form of infrared radiations of lower frequency range approx $10^{10} \,Hz$. These radiations are absorbed by greenhouse gases like methane and does not escapes into space causing warming of earth's atmosphere.

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