SAT Subject Physics Practice Question 509: Answer and Explanation

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Question: 509

10. The graph below shows a typical heat and temperature graph for a substance.

During the phase on the graph represented at Level D, the substance is

A. evaporating.
B. condensing.
C. changing phase.
D. gaining internal energy.
E. All of the above could be correct.

Correct Answer: E

Explanation:

The correct answer is (E). The temperature can only increase when no phase change occurs. The first rise on the graph is where the solid phase exists and its temperature changes.

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