One gm mol of a diatomic gas  $(\mathrm{\gamma }=1.4)$ is compressed adiabatically so that its temperature rises from  ${27}^{\mathrm{o}}\mathrm{C}$ to  ${127}^{\mathrm{o}}\mathrm{C}$. The work done will be

• A

  2077.5 joules

• B

  207.5 joules

• C

  207.5 ergs

• D

  None of the above