One mole of an ideal gas at an initial temperature of $T\, K$ does $6\, R\, joules$ of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is $\frac{5}{3}$ , the final temperature of gas will be
  • A$(T -2.4)\, K$
  • B$(T + 4) \,K$
  • C$(T -4)\, K$
  • D$(T + 2.4)\, K$
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