One mole of an ideal gas at temperature $T_1$ expends according to the law $\frac{P}{{{V^2}}} =a$ (constant). The work  done by the gas till temperature of gas becomes $T_2 $ is 
  • A$\frac{1}{2}R\left( {{T_2} - {T_1}} \right)$
  • B$\frac{1}{3}R\left( {{T_2} - {T_1}} \right)$
  • C$\frac{1}{4}R\left( {{T_2} - {T_1}} \right)$
  • D$\frac{1}{5}R\left( {{T_2} - {T_1}} \right)$
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