A theoretical ideal gas undergoes a reversible thermodynamic cycle 15. During the adiabatic expansion phase, the total heat exchange ($Q$) with the surroundings is strictly:

The efficiency of a Carnot engine working between temperatures T1 (hot) and T2 (cold) is given by:

A theoretical ideal gas undergoes a reversible thermodynamic cycle 20. During the adiabatic expansion phase, the total heat exchange ($Q$) with the surroundings is strictly:

A theoretical ideal gas undergoes a reversible thermodynamic cycle 18. During the adiabatic expansion phase, the total heat exchange ($Q$) with the surroundings is strictly:

A theoretical ideal gas undergoes a reversible thermodynamic cycle 17. During the adiabatic expansion phase, the total heat exchange ($Q$) with the surroundings is strictly:

A theoretical ideal gas undergoes a reversible thermodynamic cycle 16. During the adiabatic expansion phase, the total heat exchange ($Q$) with the surroundings is strictly:

A theoretical ideal gas undergoes a reversible thermodynamic cycle 14. During the adiabatic expansion phase, the total heat exchange ($Q$) with the surroundings is strictly: