For an isothermal expansion of a perfect gas, the value of $\frac{{\Delta P}}{P}$ is equal
  • A$ - {\gamma ^{1/2}}\frac{{\Delta V}}{V}$
  • B$ - \frac{{\Delta V}}{V}$
  • C$ - \gamma \frac{{\Delta V}}{V}$
  • D$ - {\gamma ^2}\frac{{\Delta V}}{V}$
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