A friend tells you that he knows of a situation in heat passed from one body in thermal contact with another body whose temperature was higher than that of the first.He explains that he thinks the 2^nd law of thermodynamics must have been violated.Is he correct? A) No. If the temperature difference is small enough,heat can spontaneously flow from the cooler to the hotter body. B) Yes. Heat cannot pass from one body to a hotter body. C) No. He forgot that if external work is done on the system this is possible. D) No. The cooler body can give up energy to the hotter body by radioactivity or another natural process.

Question

Quizplus · Accepted Answer

External work done on the system can cause heat to flow from a cooler body to a hotter body without violating the 2nd law of thermodynamics.

A Friend Tells You That He Knows of a Situation