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
(15)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)