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(C) The slope of an isothermal process is given by $\left( \frac{dP}{dV} ight)_{	ext{iso}} = -\frac{P}{V}$.The slope of an adiabatic process is giv

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$A$ and $B$ respectively

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(C) The slope of an isothermal process is given by $\left( \frac{dP}{dV} ight)_{	ext{iso}} = -\frac{P}{V}$.The slope of an adiabatic process is given by $\left( \frac{dP}{dV} ight)_{	ext{adia}} = -\gamma \frac{P}{V}$,where $\gamma > 1$.Since the magnitude of the slope of the adiabatic curve is $\gamma$ times the magnitude of the slope of the isothermal curve,the adiabatic curve is steeper than the isothermal curve.In the given $P-V$ diagram,for expansion (left side),curve $A$ is steeper than curve $B$. Therefore,$A$ represents the adiabatic change and $B$ represents the isothermal change.

Four curves $A, B, C$ and $D$ are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are

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