AP® Physics 1 & 2

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Moderate

Describing Entropy

APPH12-EKVWBS

Students are explaining entropy to their classmates.

Which of the following are the most accurate explanations?

Select TWO answers.

A

Entropy is a state variable that always decreases in a closed system as the order of the system decreases.

B

Entropy can be explained as "time's arrow" since a more disordered system must come later in time than the more ordered system.

C

Entropy is derived from the First Law of Thermodynamics and is the difference between the heat added to the system and work done by the system.

D

Entropy can be considered as the amount of energy unavailable to do work.