Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 20 - Entropy and the Second Law of Thermodynamics - Questions - Page 603: 10a

Answer

Entropy remains the same.

Work Step by Step

For Carnot refrigerator, $\Delta S = 0$ , Which means it is a reversible process and the entropy is zero, which also means the entropy remains the same before or after process. This type of engine is the most efficient because there is no waste of energy.
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