In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?
Correct answer: B. Cp = Cv
- A. Cp < Cv
- B. Cp = Cv
- C. Cp > Cv
- D. C ≥ Cv
Explanation
An ideal-gas adiabat follows PV^γ = constant, whereas an isotherm follows PV = constant. They have the same slope only when γ = Cp/Cv = 1, which requires Cp = Cv.
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