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One mole of helium is adiabatically expanded from its initial state $({P_i},{V_i},{T_i})$ to its final state $({P_f},{V_f},{T_f})$. The decrease in the internal energy associated with this expansion is equal to
  • A${C_V}({T_i} - {T_f})$
  • B${C_P}({T_i} - {T_f})$
  • C$\frac{1}{2}({C_P} + {C_V})(Ti - {T_f})$
  • D$({C_P} - {C_V})({T_i} - {T_f})$
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