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Question

The specific heat of a gas in a polytropic process is given by:

A
Rγ1+Rz1
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B
R1γ+R1z
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C
Rγ1RN1
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D
R1γR1N
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Solution

The correct option is A Rγ1+Rz1
dQ=nCdT
PVz=constant
nCdT=dU+PdV
nCdT=nCVdT+PdV
nCΔT=nCVΔT+PVzVzdV
As, PiVzi=PfVzf
i=initial
f=final
PVzVzdV=PVzVzdV
PiViz+1+PfVfz+1=nRΔT1z
As, PV=nRT
ΔT=TfTi
C=Cv+R1z;
As, CpCV=Y
CPCV=R
CV=RY1,
So, C=RY1+R1z

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