Answer
c)
Work Step by Step
In order to determine how much the efficiency will change, you need to know the original value of $T_h$. After all, efficiency depends on how much the value of $T_h$ is above the value of $T_c$.
Essential University Physics: Volume 1 (4th Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0-134-98855-8
ISBN 13:
978-0-13498-855-9
Chapter 19 - Section 19.2 - The Second Law of Thermodynamics - Got It? - Page 350: 19.2
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