A gas ($\gamma = 1.3)$ is enclosed in an insulated vessel fitted with insulating piston at a pressure of ${10^5}\,N/{m^2}$. On suddenly pressing the piston the volume is reduced to half the initial volume. The final pressure of the gas is
  • A${2^{0.7}} \times {10^5}$
  • B${2^{1.3}} \times {10^5}$
  • C${2^{1.4}} \times {10^5}$
  • D
    None of these
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