Q.

Green house effect is the heating up of the Earth's atmosphere which is due to –

A. the ultraviolet rays
B. y-rays
C. the infra-red rays
D. X-rays
Answer» C. the infra-red rays
Explanation: 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 reradiation 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.
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