In pressure-volume disgram given below, the isochoric, isothermal, and isobaric --- respectively, are
Correct answer: B. DC, CB, BA
- A. AB, BC, CD
- B. DC, CB, BA
- C. CD, DA, AB
- D. BA, AD, DC
Explanation
In the pressure-volume diagram, an isochoric process is characterized by a constant volume (ΔV=0), which corresponds to a vertical line. For the process DC, ΔV=0, confirming it as isochoric. An isothermal process maintains a constant temperature (ΔT=0), typically represented by a hyperbolic curve on the diagram. Process CB is isothermal. An isobaric process involves constant pressure (∆P=0), shown as a horizontal line. Process BA is isobaric. Other options misidentify the processes, not aligning with these characteristics.
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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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