Question

The reversible expansion of an ideal gas under adiabatic and isothermal condition is shown in the figure. Which of the following statements is incorrect?

• A. $T_1=T_2$
• B. $T_3>T_1$
• C. $W_{isothermal}>W_{adiabatic}$
• D. $△U_{isothermal}>△U_{adiabatic}$

Answer 1

The correct option is B $T_3>T_1$

$T_1=T_2$ because process is isothermal.
work done in adiabatic process is less than in isothermal process beacause area covered by isothermal curve is more than the area covered by the adiabatic curve.
In adiabatic process expansion occurs by using internal energy, hence, it decreases while in isothermal process temperature remains constant that's why no change in internal energy.