AAMC Section Bank #7

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jeep1010

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Can someone explain how to get the answer B?

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There is no mention of either specific heats larger than water's or solid vs. other phases in the passage. So A and D can be eliminated. The second law says that the entropy of the universe always increases. This problem has nothing to do with entropy - only enthalpy and heat. So B must be correct. It's correct because it says specifically in the passage that this is a "fast and localized heating process" which creates sound waves that can then be recorded.
 
yeah i read that and chose B but I just wanted to make sure I wasn't overlooking any conceptual stuff when eliminating other answers.
 
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