CBSE Class 10 Answered
Solar cooker and Green house effect
Asked by fathima12 | 13 Sep, 2010, 02:10: PM
Expert Answer
Greenhouse effect: The phenomenon whereby the earth's atmosphere traps solar radiation, caused by the presence in the atmosphere of gases such as carbon dioxide, water vapor, and methane that allow incoming sunlight to pass through but absorb heat radiated back from the earth's surface.
The same purpose is served by the glass plate in solar cookers. Heat is produced when high frequency light is converted into low frequency infrared radiation. Ultraviolet and visible light easily passes through glass, however when they strike a darkened surface they are converted into long wave infrared radiation. The glass or special solar glazing traps these long waves. (hence answers the question why glass plate is used) This is known as the greenhouse effect.
Answered by | 13 Sep, 2010, 09:37: PM
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