$5.6$ 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$\frac{9}{2} R T_1$
IIT 2011, Diffcult
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