11.Thermodynamics
medium

The slopes of isothermal and adiabatic curves are related as

A

Isothermal curve slope = adiabatic curve slope

B

Isothermal curve slope = $\gamma \times $ adiabatic curve slope

C

Adiabatic curve slope = $\gamma \times $ isothermal curve slope

D

Adiabatic curve slope = $\frac{1}{2} \times $isothermal curve slope

Solution

(c) For Isothermal process $PV = $constant
$ \Rightarrow \left( {\frac{{dP}}{{dV}}} \right) = \frac{{ – P}}{V} = $ Slope of Isothermal curve
For adiabatic$P{V^\gamma } = $constant
$ \Rightarrow \frac{{dP}}{{dV}} = \frac{{ – \gamma P}}{V} = $ Slop of adiabatic curve slope

Clearly, ${\left( {\frac{{dP}}{{dV}}} \right)_{{\rm{adiabatic}}}} = \gamma {\left( {\frac{{dP}}{{dV}}} \right)_{{\rm{Isothermal }}}}$

Standard 11
Physics

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