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Which of the following processes is reversible?

1. Transfer of heat by conduction
2. Transfer of heat by radiation
3. Isothermal compression
4. Electrical heating of a nichrome wire

Correct answer: Isothermal compression

Solution

Isothermal compression is a reversible process if carried out infinitely slowly, allowing the system to remain in equilibrium. The other processes involve irreversibilities like heat loss or entropy generation.

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