For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to (where $\gamma$ is the ratio of specific heats) :

Question

$ - {1 \over \gamma }{{dV} \over V}$

$ - \gamma {V \over {dV}}$

$ - \gamma {{dV} \over V}$

${{dV} \over V}$

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