SAT Subject Physics Practice Question 520: Answer and Explanation

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Question: 520

6. New thermos bottles have the ability to keep hot substances hot for several days. The thermos bottles have a highly polished interior made of stainless steel, which makes them almost unbreakable. These thermos bottles keep substances hot by reducing heat loss due to

A. absorption
B. conduction
C. convection
D. radiation
E. evaporation

Correct Answer: D


The correct answer is (D). The highly polished interior surface of the thermos bottle reflects radiated heat from the substance back into the substance it is keeping hot.

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