Initial pressure and volume of a gas are $ P$ and $V$ respectively. First it is expanded isothermally to volume $4V$ and then compressed adiabatically to volume $ V$. The final pressure of gas will be
A$1P$
B$2P$
C$4P$
D$8P$
Medium
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B$2P$
b (b) In isothermal process ${P_1}{V_1} = {P_2}{V_2}$
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