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