For which combination of working temperatures is the efficiency of Carnot's engine the highest?
Correct answer: A. 100 K, 80 K
- A. 100 K, 80 K
- B. 80 K, 60 K
- C. 40 K, 20 K
- D. 60 K, 40 K
Explanation
The efficiency of Carnot's engine depends on the temperature difference between the hot and cold reservoirs. The higher the temperature difference, the higher the efficiency. Therefore, the combination with the highest efficiency is the one with the greatest temperature difference, which is (a) 100 K, 80 K.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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