SAT Subject Physics Practice Question 536: Answer and Explanation

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Question: 536


The idealized P-V diagram above shows a complete cycle through compression and expansion of a gas. The questions below relate to the processes within the cycle.

Which letter shows isothermal compression?

A. A
B. B
C. C
D. D
E. E

Correct Answer: C


The correct answer is (C). The part of the cycle represented by the letter C is compression. During compression, the system heat is kept constant by allowing heat to escape from the system.

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