Q. For irreversible expansion of an ideal gas under isothermal condition, the correct option is:
A) $\Delta U \neq 0, \Delta S_{total} \neq 0$
B) $\Delta U = 0, \Delta S_{total} \neq 0$
C) $\Delta U \neq 0, \Delta S_{total} = 0$
D) $\Delta U = 0, \Delta S_{total} = 0$
Explanation
[Solution] Isothermal ideal gas: $\Delta U = 0$. An irreversible process gives $\Delta S_{total} > 0$. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.