Fig. 1.1 shows a glass greenhouse in sunlight. Why does the air inside a greenhouse become warmer than the air outside?
Question 1 Report
Fig. 1.1 shows a glass greenhouse in sunlight. 
Why does the air inside a greenhouse become warmer than the air outside?
Answer Details
The correct answer is that short-wave radiation enters, but the warmed inside re-emits longer-wave radiation that is trapped. Short-wave radiation from the Sun passes through the glass and is absorbed by the plants and soil, which warm up and re-radiate at longer infrared wavelengths that the glass does not transmit, so the energy stays inside. Convection of cold air inward would cool it, not warm it; the glass does not reflect all radiation away, and it is a poor conductor, so heating by conduction is not the cause.
Download The App On Google Playstore
Everything you need to excel in your exams
