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NEET2026PhysicsChapterActual

An ideal gas is compressed from a common initial state I to a final volume V_f via three different processes as shown in the P-V diagram. The processes are known to be isothermal, adiabatic, and isobaric. Which curve correctly represents the adiabatic compression?

Options

  1. ACurve 1
  2. BCurve 2
  3. CCurve 3
  4. DEither Curve 1 or 2 depending on the atomicity of the gas

Correct answer

A. Curve 1

Step-by-step solution

For an ideal gas, the equations for the given processes are: Isobaric: P = constant Isothermal: PV = constant Adiabatic: PV^ = constant Curve 3 is a horizontal line ( P = constant ), so it represents the isobaric process. The slope of the P-V curve is given by dP dV . For an isothermal process: dP dV = - P V For an adiabatic process: dP dV = - P V Since the heat capacity ratio > 1 , the magnitude of the slope for the adiabatic curve is greater than that for the isothermal curve. This means the adiabatic curve is st

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