試題詳解

20. Which of the following statements is correct?
(A). The system does work on the surroundings when an ideal gas expands against a constant external pressure.
(B). The internal energy of a system increases when more work is done by the system than heat is flowing into the system.
(C). The internal energy of a system decreases when work is done on the system and heat is flowing into the system.
(D). All the statements are true.
(E). All the statements are false.