Which of the following processes is reversible?

Step-by-step solution

(a)It is the process by which heat is transmitted from one place to another without heating the intervening medium. Hence, it is not a reversible process. (b) Nichrome wire is made of alloys and has high resistance. When current is passed through it, heat is produced. So, here electrical energy is converted into heat energy. Hence, it is not a reversible process. (c) It is the process by which heat is transmitted from one point to another through a substance in the direction of fall of temperature without the actua