Question

Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure. AB $\rightarrow$ Isothermal expansion AC $\rightarrow$ Adiabatic expansion Which of the following options is not correct ?

• A. $\Delta S_{isothermal} > \Delta S_{adiabatic}$
• B. T$_A$ = TB
• C. $W_{isothermal} > W_{adiabatic}$
• D. T$_c$ > TA

Answer 1

Answer: (D)

T$_c$ > TA

Answer 2

In adiabatic expansion cooling effect will take place, $T_C$ will be less then $T_A$. in adiabatic expansion $q = 0$ $\Delta U = w$ $Wpv < 0$ $\Delta U < 0$ $nC_{vm} \Delta T < 0$ $\Delta T < 0$ $T_C - T_A < 0$ $T_C < T_A$