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Question

One mole of an ideal gas with CpCv=γ at absolute temperature T1 is adiabatically compressed from an initial pressure
P1 to a final pressure P2. The resulting temperature T2 of the gas is given by


A

T2=T1(P2P1)γγ1

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B

T2=T1(P2P1)γ1γ

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C

T2=T1(P2P1)γ

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D

T2=T1(P2P1)γ1

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Solution

The correct option is B

T2=T1(P2P1)γ1γ


For an adiabatic process, PVγ=constant. The ideal gas equation is PV=RT or V=RTP. Therefore, we haveP(RTP)γ=constantor TγPγ1=constant (R is a constant)Tγ2Pγ12=Tγ1Pγ11or T2=T1(P2P1)γ1γ


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