NEET Physics Thermodynamics Questions Solved


If γ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is 

(1) 1γ

(2) γ

(3) γ-1

(4) γ+1

(2) Slope of adiabatic curve = γ × (Slope of isothermal curve)

Isothermal proccess : PV=constantDifferentiating, we get   PdV+VdP=0  Slope of isothermal curve dPdViso =-PV                      .........1Adiabtic process: PVγ=constantDifferentiating, we get   PγVγ-1 dV+Vγ dP=0 Slope of adiabatic curve dPdVadi = -γPV                        ............2 Ratio of slopes  dPdVadidPdViso=-γP/V-P/V=γ

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