Question

A system goes from A to B in two processes I and II as shown in the fig. If $\Delta U_1$ and $\Delta U_2$ are the changes in internal energies in the processes I and II respectively then.

• A. $\Delta U_2<\Delta U_1$
• B. $\Delta U_2>\Delta U_1$
• C. Relation between $\Delta U_2$ and $\Delta U_1$ can not be determined
• D. $\Delta U_2=\Delta U_1$

Answer 1

The correct option is D $\Delta U_2=\Delta U_1$

Since, internal energy is a state function whose value depends only on the initial and final values and not the path taken, its value will remain the same for both the processes A and B.

Thus, $\Delta U_1=\delta U_2$