Carnot Engine: Two ideal Carnot heat engines have the same efficiency. One operates between 5.0 × 102 K and 3.0 × 102 K, and the other between 4.0 × 102 K and some lower temperature. What is the lower temperature?
A. 200 K
B. 220 K
C. 240 K
D. 260 K
E. 280 K
Answer: C
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