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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B$ - \frac{{\Delta V}}{V}$
b (b)Differentiate $PV = $constant w.r.t $V$
==> $P\Delta V + V\Delta P = 0$==> $\frac{{\Delta P}}{P} = - \frac{{\Delta V}}{V}$
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