SAT Subject Physics Practice Question 201: Answer and Explanation

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Question: 201

47. A block of ice, initially at –20°C, is heated at a steady rate until the temperature of the sample reaches 120°C. Which of the following graphs best illustrates the temperature of the sample as a function of time?

A.
B.
C.
D.
E.

Correct Answer: A

Explanation:

Ice melts at 0°C and boils at 100°C. During these phase transitions, the temperature remains constant. Therefore, the graph of the sample’s temperature must be momentarily flat at both 0°C and at 100°C.

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