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31. One mole of helium is adiabatically expanded from its initial state

(Pi,Vi,Ti) to its final state (Pf,Vf,Tf) . The decrease in the internal energy associated with this expansion is equal to

(a)  Cv(Ti-Tf)                              (b) CP(Ti-Tf)

(c)  (1/2)(Cp+Cv)(Ti-Tf)          (d) (Cp-Cv)(Ti-Tf)

Answer-a

(13)

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