In the Carnot cycle, internal energy in one cycle:
Correct answer: D. Remains constant
- A. Increases
- B. Decreases
- C. Zero
- D. Remains constant
Explanation
In the Carnot cycle, the internal energy of the working substance remains constant throughout the cycle. This is because the Carnot cycle is composed of reversible adiabatic and isothermal processes, which result in no net change in internal energy.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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