SAT Subject Physics Practice Question 508: Answer and Explanation

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Question: 508

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

Which of the levels represents the solid phase of the substance?

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

Correct Answer: A


The correct answer is (A). During the time when the substance is at the part of the graph, it can either evaporate or condense. This entails a phase change, which is accomplished by the substance gaining energy.

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