$A$ monoatomic ideal gas initially at temperature $T_1$ is enclosed in a cylinder fitted with a massless,frictionless piston. By releasing the piston suddenly,the gas is allowed to expand adiabatically to a temperature $T_2$. If $L_1$ and $L_2$ are the lengths of the gas columns before and after expansion respectively,then $\frac{T_2}{T_1}$ is

  • A
    $\frac{L_1}{L_2}$
  • B
    $\frac{L_2}{L_1}$
  • C
    $\left(\frac{L_1}{L_2}\right)^{2/3}$
  • D
    $\left(\frac{L_2}{L_1}\right)^{2/3}$

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