$5.6\,liter$ of helium gas at $STP$ is adiabatically compressed to $0.7\,liter$ . Taking the initial temperature to be $T_1$ , the work done in the process is

  • A

    $\frac{9}{8}R{T_1}$

  • B

    $\frac{3}{2}R{T_1}$

  • C

    $\frac{15}{8}R{T_1}$

  • D

    $\frac{9}{2}R{T_1}$

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