All the heat supplied to a system is converted into work in the process.
Correct answer: C. Isothermal
- A. Isochoric
- B. Isobaric
- C. Isothermal
- D. Isentropic
Explanation
For an ideal gas, internal energy is a function of temperature. In an isothermal process, the temperature is constant (ΔT = 0), so the change in internal energy is zero (ΔU = 0). From the first law, ΔU = Q - W, which means 0 = Q - W, or Q = W.
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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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