An Adiabatic Free Expansion of a Gas in a Thermally

question 4

Multiple Choice

An adiabatic free expansion of a gas in a thermally isolated container is not reversible because

• A) work must be done on the gas to return it to its original volume.
• B) heat must be exchanged with the surroundings to return the gas to its original temperature.
• C) its internal energy has a greater value after the expanded gas is returned to its original volume and temperature.
• D) of all of the above.
• E) of (a) and (b) above only.