Which of the following processes is reversible?

Options

A. Transfer of heat by radiation
B. Tranfer of heat by condution
C. Isothermal compression
D. Electrical heating of a nichrome wire

Answer

To determine which of the given processes is reversible, we need to understand the characteristics of reversible processes. A reversible process is one that can be reversed by an infinitesimal change in a variable, and it must be carried out in such a way that the system remains in equilibrium with its surroundings throughout the process.

### Step-by-Step Solution:

1. **Understand Reversible Processes**:
- A reversible process is defined as a process that can be reversed without leaving any change in the system or surroundings. It occurs through a series of equilibrium states.

2. **Analyze the Given Processes**:
- We need to evaluate the processes A, B, C, and D to determine which one can be classified as reversible.

3. **Process A: Transfer of Heat by Radiation**:
- This process is typically spontaneous and does not return to its original state. Once heat is radiated away, it cannot be reversed simply by changing conditions. Thus, this process is not reversible.

4. **Process B: Transfer of Heat by Conduction**:
- Similar to radiation, conduction involves the transfer of heat from a hotter object to a cooler one. Once the heat has been transferred, the original state cannot be restored without external work. Therefore, this process is also not reversible.

5. **Process C: Isothermal Compression**:
- In isothermal compression, the temperature of the system remains constant while the volume is decreased. This process can be reversed by expanding the gas back to its original volume while maintaining the same temperature. Since it can return to its original state without any net change, this process is reversible.

6. **Process D: Other Processes**:
- Without specific details about process D, we can generally state that many common processes (like spontaneous mixing, irreversible chemical reactions, etc.) are not reversible.

7. **Conclusion**:
- Based on the analysis, the only process that can be classified as reversible is **Isothermal Compression**.

### Final Answer:
The reversible process among the given options is **Isothermal Compression**.

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