One mole of an ideal gas at an initial temperature of $T$ $K$ does $6R$ 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 $(R=8.31 \ J \ mole^{-1} \ K^{-1})$.
- A$(T+4.2) \ K$
- B$(T-4.2) \ K$
- C$(T+4) \ K$
- D$(T-4) \ K$
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