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The internal energy of a system during isothermal process

Correct answer: D. remain constant

  • A. decrease
  • B. increase
  • C. become zero
  • D. remain constant

Explanation

During an isothermal process, the temperature of the system remains constant. This means that there is no change in the average kinetic energy of the particles in the system. The internal energy of a system is directly related to the average kinetic energy of its particles. Hence, option D is correct.

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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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