The ratio of the slopes of adiabatic and isothermal curves is
A
1γ
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B
1γ3
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C
γ3
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D
γ
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Solution
The correct option is Dγ For an isothermal process PV=constant Differentiating we get PdV+VdP=0 or dPdV=−PV or tanθ=dPdV=−PV-----------------------(i) For a adiabatic process we have PVγ=constant Differentiating we get dPVγ+PγVγ−1=0 or dPdV=−γPVγ−1Vγ=−γ(PV) Thus slope is tanθ=dPdV=−γPV................(ii) Thus we get the ratio of the slopes of adiabatic and isothermal curves from (i) and (ii) as γ