Question

In the given figure, $1$ represents isobaric, $2$ represents isothermal and $3$ represents adiabatic processes of an ideal gas. If $\Delta U_{1}, \Delta U_{2}, \Delta U_{3}$ be the changes in internal energy in these processes respectively, then

• A. $\Delta U_{1}<\Delta U_{2}<\Delta U_{3}$
• B. $\Delta U_{1}>\Delta U_{3}<\Delta U_{2}$
• C. $\Delta U_{1}=\Delta U_{2}>\Delta U_{3}$
• D. $\Delta U_{1}>\Delta U_{2}>\Delta U_{3}$

Answer 1

Answer: (D)

$\Delta T_{1}=T_{0}$
$\Delta T_{2}=0$
$\Delta T_{3}=-v e$
$\Rightarrow \Delta U_{1}>\Delta U_{2}>\Delta U_{3}$