SAT Subject Physics Practice Question 333: Answer and Explanation

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Question: 333

29. A white disk and a black disk are placed on top of a snow bank on a sunny day. The black disk sinks deeper into the snow because

A. the black disk reflects light better.
B. the white disk reflects light better.
C. the black disk radiates heat better.
D. the white disk radiates heat better.
E. both of the disks reflect light and radiate heat at the same rate.

Correct Answer: C


The correct answer is (C). The black disk absorbs heat better than the white disk, and it radiates heat away faster.

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