the greenhouse effect conceptual physics text correlation: section 22.7 43
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The Greenhouse Effect
Conceptual Physics
Text Correlation: Section 22.7
43
Question 1
• To keep the interior of a car from heating too much, it is common to put a reflecting surface behind the windshield. How does this work?
• Answer: Light does not change frequency when reflected (a blue shirt is still blue in a mirror!) .So light that has a frequency to get through glass in the first place will reflect back through the glass.
• Light that gets absorbed, however, is not reradiated at the same frequency. The reemitted light has a frequency proportional to the temperature of the emitter. The low frequency of this reradiated light keeps it from getting through the glass.
Question 2
• Is the greenhouse effect something the world would be better without?
• Answer: No! Without the greenhouse effect, the world's average temperature would be a frigid -18°C. The environmental concern is too much greenhouse effect.
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