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
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(a)$\Delta U = \mu {C_V}\Delta T = 1 \times {C_V}({T_f} - {T_i}) = - \,{C_V}({T_i} - {T_f})$
==> |$\Delta U$| $= C_V (T_i -T_f)$
==> |$\Delta U$| $= C_V (T_i -T_f)$
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