$5.6$ $liter$ 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}$$RT_1$
  • B$\frac{3}{2}$$RT_1$
  • C$\frac{15}{8}$$RT_1$
  • D$\frac{9}{2}$$RT_1$
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