The internal energy of a system during an isothermal process:
Correct answer: D. Remain constant
- A. Decreases
- B. Increases
- C. Become zero
- D. Remain constant
Explanation
In an isothermal process, the temperature of the system remains constant. Since internal energy is directly related to temperature, it also remains constant during such a process. This contrasts with other processes like isobaric, where pressure stays constant, and adiabatic, where no heat is transferred. Therefore, the correct answer is that the internal energy remains constant. The other options are incorrect because they suggest a change in internal energy, which does not occur in an isothermal process.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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