Question

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition?

• A. $q=0,\Delta T\ne 0,w=0$
• B. $q\ne 0,\Delta T=0,w=0$
• C. $q=0,\Delta T=0,w=0$
• D. $q\ne 0,\Delta T<0,w\ne 0$

Answer 1

The correct option is C $q=0,\Delta T=0,w=0$

For free expansion of an ideal gas under adiabatic condition $q=0,\Delta T=0,w=0$. For free expansion, $w=0$, adiabatic process, $q=0\Delta U=q+w=0$.
Internal energy remain constant means $\Delta T=0$.